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Update on Revised McGeer Criteria, Clostridium difficile Infections (CDI) and UTIs in the Long Term Care Facility


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Title: Update on Revised McGeer Criteria, Clostridium difficile Infections (CDI) and UTIs in the Long Term Care Facility

Update on Revised McGeer Criteria, Clostridium
difficile Infections (CDI) and UTIs in the Long
Term Care Facility
  • Edward C. Oldfield, III, MD
  • Virginia Medical Directors Association
  • September 29, 2012

Ageing Population
  • By 2030, 20 of the U.S. population will be over
    65 years old.
  • Currently, gt 16,000 nursing homes/LTCFs with 1.5
    million residents in the U.S.

Infections in the LTCF
  • Infections in LTCFs are more frequent than
    hospital acquired infections about 2.5 million
    each year.
  • Infections cause 25-50 of all hospital transfers
    or 250,000 admissions each year.
  • 30-50 of all hospital admissions for those over
    65 y.o.
  • Over 100,000 deaths in LTCFs each year at a cost
    of 1 billion.

Antibiotics and Nursing Homes
  • 54 of nursing home patients receive a course of
    antibiotics each year.
  • Most common indication is for urinary tract
    infections 36 of all antibiotics.
  • 9 of all prescriptions are for asymptomatic
    bacteriuria, which is inappropriate.
  • Warren J. J Am Geriatr Soc

Infection Control in LTCFs
  • LTCFs pose multiple challenges to infection
  • High prevalence of infections.
  • High rates of colonization with antimicrobial
    resistant organisms.
  • Frequent and often inappropriate prescribing of
  • Moro M. Infect Control Hosp Epidemiol.

Infection Control in LTCFs
  • Frequent transfer of residents from the hospital.
  • Growing elderly populations with increasingly
    complex medical problems.
  • Scarce resources.
  • Absent/poor coordination of clinical and nursing

The Perfect Storm of Antimicrobial Resistance
Surveillance in LTCFs
  • Surveillance of infections is universally
    recommended as the core of infection control
  • Increases awareness of the problem.
  • Establishes an infection control presence in
    the facility.
  • Identifies critical areas for infection control.
  • Determines trends.
  • Identifies and prevents outbreaks in a timely

  • Mc Geer Criteria. Definitions of Infections in
    Long Term Care Facilities. Am J Infect Control
  • Revisiting the McGeer Criteria.
  • Surveillance Definitions of Infections in Long
    Term Care Facilities.
  • SHEA/CDC Position Paper.
  • Stone N. Infection Control Hosp Epidemiol.
  • 201233965-77.

Revised McGeer Criteria
  • Focus was to increase the specificity and PPV of
    the criteria to limit unnecessary interventions
    and curb misallocation of scarce resources.
  • Will be less sensitive than clinical diagnoses.
  • Revised criteria provide explicit definitions for
    fever, acute confusion or altered mental status
    and acute functional decline.
  • Attempt to harmonize the definitions used in
    acute and LTCFs (using gt 2 days at the facility
    to define a HAI).

Revised McGeer Criteria
  • Criteria for systemic infections, common cold,
    conjunctivitis, ear infections, herpes simplex
    and zoster were left unchanged.
  • Influenza was modified only to track cases
    outside the influenza season, as a consequence of
    pandemic H1N1.
  • Criteria for gastrointestinal infections were
    unchanged, but specific criteria for norovirus
    and C. difficile were added.
  • Skin infection criteria were not substantially
    changed, but NHSN criteria for surgical site
    infections was added.

Revised McGeer Criteria
  • Major changes were made to the criteria for
    defining respiratory track and UTIs.
  • Original McGeer criteria did not include a
    positive urine culture to define a UTI.
  • More than half of residents suspected of having a
    UTI have negative cultures despite the high
    prevalence of asymptomatic bacteriuria.
  • Juthani-Mehta M. J Am Geriatric Soc

Revised McGeer Criteria
  • Urinary tract symptoms alone are not sufficient
    to identify cases of UTI with a high level of
  • Revised criteria require a positive urine culture
    as a necessary condition to diagnose a UTI.

Revised McGeer Criteria
  • Define which infections should have priority in
    LTCF infection control, either because they are
    avoidable or cause significant morbidity and
  • Priorities include
  • Viral respiratory, GI and conjunctivitis due to
    high transmissibility.
  • UTI, pneumonia, GI infections, SSTI (morbidity).
  • Infections that can lead to serious outbreaks
    (hepatitis, norovirus, scabies, influenza, group
    A streptococci). Even a single case should
    trigger a more intensive investigation.

HBV and Glucose Monitoring
  • 8 residents hospitalized, 6 died of acute HBV in
    a North Carolina assisted-living facility in 2010
    related to facility staff assisting with blood
    glucose monitoring.
  • 16 outbreaks of HBV have been reported related to
    sharing of glucose monitoring equipment in
    assisted-living facilities since 2004.
  • Moore Z. MMWR 201160182

HBV and Glucose Monitoring
  • VDH was notified of acute HBV infections in
    residents from 4 assisted living facilities
    regulated by state agencies (not CMS) between
    2/2009 and 11/2011.
  • All infections were among residents receiving
    assisted monitoring of blood glucose (AMBG).
  • Attack rates by facility among susceptible
    residents receiving AMBG ranged from 17-92.
  • AMBG has been responsible for 27 of 29 (93) HBV
    outbreaks in LTCFs since 1996.
  • MMWR 201261339.

HBV and Glucose Monitoring
  • 3 of 4 facilities had lapses in infection
    prevention practices
  • Shared use of penlet-style reusable finger stick
    devices (intended only for a single patient).
  • Failure to clean and disinfect shared
  • Poor hand hygiene techniques.

Diabetes and HBV
  • 10/2011 ACIP recommended that adults 19-59 y.o.
    be vaccinated against HBV.
  • Adults gt59 y.o. with DM may be vaccinated at the
    discretion of their physician.

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Blood Glucose Meters
  • Whenever possible, blood glucose meters should
    not be shared.
  • If they must be shared, the device should be
    cleaned and disinfected after every use, per
    manufacturers instructions.
  • If the manufacturer does not specify how the
    device should be cleaned and disinfected then it
    should not be shared.

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Fingerstick Devices
  • Fingerstick devices should never be used for more
    than one person.
  • Single-use, auto-disabling fingerstick devices
    These are devices that are disposable and prevent
    reuse through an auto-disabling feature.
  • In settings where assisted monitoring of blood
    glucose is performed, single-use, auto-disabling
    fingerstick devices should be used.

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Insulin Pens
  • Insulin pens containing multiple doses of insulin
    are meant for use on a single person only, and
    should never be used for more than one person,
    even when the needle is changed.
  • Insulin pens should be clearly labeled with the
    persons name or other identifying information to
    ensure that the correct pen is used only on the
    correct individual.

Insulin Pens
  • Hospitals and other facilities should review
    their policies and educate their staff regarding
    safe use of insulin pens and similar devices.
  • If reuse is identified, exposed persons should be
    promptly notified and offered appropriate
    follow-up, including bloodborne pathogen testing.

  • CDCs National Healthcare Safety Network (NHSN)
    web site provides LTCFs a customized system to
    track infections in a streamlined and systematic
    way. Site provides NHSN enrollment, forms,
    toolkits, protocols and training to report C.
    difficile, MRSA and other drug-resistant
    infections, UTIs, and prevention process
    measures, including hand hygiene adherence.

  1. New Case surveillance definition.
  2. Who to treat

New UTI Surveillance Definition
  • For residents without an indwelling catheter
    (both criteria
  • 1 and 2 must be present).
  • Criteria 1 At least 1 of the following sign or
  • Acute dysuria or acute pain, swelling, or
    tenderness of the testes, epididymis, or
  • Fever or leukocytosis and at least 1 of the
    following localizing urinary tract symptoms (must
    be new or marked increase) acute costovertebral
    angle pain or tenderness, suprapubic pain, gross
    hematuria, incontinence, urgency, frequency.

UTI Surveillance Definition
  • In the absence of fever or leukocytosis, then 2
    or more of the following localizing urinary tract
  • Suprapubic pain
  • Gross hematuria
  • New or marked increase in incontinence
  • New or marked increase in urgency
  • New or marked increase in frequency

UTI Surveillance Definition
  • Criteria 2. One of the following microbiologic
  • At least 100,000 cfu/mL of no more than 2 species
    of microorganisms in a voided urine sample.
  • At least 100 cfu/mL of any number of organisms in
    a specimen collected by in-and-out catheter
  • Urine specimens for culture should be processed
    as soon as possible, preferably within 12 h.
  • If urine specimens cannot be processed within 30
    min of collection, they should be refrigerated.
    Refrigerated specimens should be cultured within
    24 h.

UTI Surveillance Definition
  • UTI should be diagnosed when there are localizing
    genitourinary signs and symptoms and a positive
  • culture result.
  • A diagnosis of UTI can be made without localizing
    symptoms if a blood culture isolate is the same
    as the organism isolated from the urine and there
    is no alternate site of infection.

UTI Surveillance Definition
  • In the absence of a clear alternate source of
    infection, fever or rigors with a positive urine
    culture result in the noncatheterized resident or
    acute confusion in the catheterized resident will
    often be treated as UTI.
  • However, evidence suggests that most of these
    episodes are likely not due to infection of a
    urinary source.

UTI Surveillance Definition
  • For residents with an indwelling catheter (both
    criteria 1
  • and 2 must be present)
  • Criteria1 (at least 1 of the following
  • Fever, rigors, or new-onset hypotension, with no
    alternate site of infection.
  • Either acute change in mental status or acute
    functional decline, with no alternate diagnosis
    and leukocytosis.
  • New-onset suprapubic pain or costovertebral angle
    pain or tenderness.
  • Purulent discharge from around the catheter or
    acute pain, swelling, or tenderness of the
    testes, epididymis, or prostate

UTI Surveillance Definition
  • Criteria 2. Urinary catheter specimen culture
    with at least
  • 100,000 cfu/mL of any organism(s).
  • Recent catheter trauma, catheter obstruction, or
    new onset hematuria are useful localizing signs
    that are c/w UTI but are not necessary for
  • Urinary catheter specimens for culture should be
    collected following replacement of the catheter
    (if current catheter has been in place for gt14 d).

UTI Surveillance Definition
  • Pyuria (gt/ 10 WBC/hpf) does not differentiate
    symptomatic UTI from asymptomatic bacteriuria.
  • Absence of pyuria in diagnostic tests excludes
    symptomatic UTI in residents of long-term care

Acute Functional Decline
  • A new 3-point increase in total ADL score (range,
    028) from baseline, based on the following 7 ADL
    items, each scored from 0 (independent) to 4
    (total dependence)
  • Bed mobility
  • Transfer
  • Locomotion within LTCF
  • Dressing
  • Toilet use
  • Personal hygiene
  • Eating

Acute Change in Mental Status
  • Acute change in mental status from baseline (all
    criteria must be present)
  • Acute onset.
  • Fluctuating course.
  • Inattention.
  • AND
  • Either disorganized thinking or altered level of

Confusion Assessment Method Criteria
  • Acute change in residents mental status from
  • Fluctuating Behavior coming and going or
    changing in severity during the assessment.
  • Inattention difficulty focusing attention (eg,
    unable to keep track of discussion or easily
  • Disorganized thinking thinking is incoherent
    (rambling conversation, unclear flow of ideas,
    unpredictable switches in subject).
  • Altered level of consciousness level of
    consciousness is described as different from
    baseline (hyperalert, sleepy, drowsy, difficult
    to arouse, nonresponsive).

Treating Asymptomatic Bacteriuria
  • Prospective randomized trials of screening for or
    treating asymptomatic bacteriuria have shown
  • No decrease in the rate of symptomatic infection.
  • No improvement in survival.
  • No change in chronic genitourinary symptoms.
  • Nicolle L. Am J Med
  • Nicolle L. NEJM
  • Abrutyn E. Ann Intern Med

Asymptomatic UTI Nursing Home
  • 172 nursing home residents with an abnormal
    urinalysis and no Foley catheter.
  • 146 did not meet criteria for treatment, 76 were
    not treated.
  • None developed adverse consequences.
  • No deaths or hospitalizations attributed to
    worsening infection or sepsis occurred during the
    following 3 months.
  • Rotjanapan P. Arch Int Med

Chronic Incontinence Ouslander et
al Ann Int Med 122 753
Randomized, placebo controlled trial of
antibiotic therapy
Detrimental Effects of Treating Asymptomatic UTI
  • By 6-8 weeks after treating asymptomatic patients
    with bacteriuria, 60-80 will have recurrence
    with the same or a new infecting organism.
  • Subjects who receive antimicrobial therapy for
    asymptomatic bacteriuria have
  • Increased frequency of adverse events from the
  • Increased reinfection with resistant organisms.
  • Increased cost.

UTI and C. difficile
  • 172 nursing home residents with an abnormal
    urinalysis and no Foley catheter.
  • 85 did not meet criteria for treatment, but 41
    of them were started on antibiotics.
  • 12 who received inappropriate antibiotics
    developed C. difficile infection within 3 weeks.
  • Overall, those who received inappropriate
    antibiotics were 8-fold more likely to develop C.
    difficile within 3 months.
  • Rotjanapan P. Arch Int Med

Antibiotics and Warfarin
  • Exposure to any antibiotic within 15d increased
    the chance of bleeding with hospitaliztion by
  • Azoles (eg fluconazole) increased risk by
    4.5-fold, TMP SMZ 2.7, cephalosporins 2.5,
    penicillins 1.9, macrolides 1.9, quinolones 1.7.
  • Interference with metabolism (azoles, TMP SMZ)
    and disruption of bacteria that synthesize Vit K.
  • Monitor INR one week after starting antibiotics.
  • Baillargeon J. Am J Med 2012125183-9.

Mortality, Elderly Men
NEJM, 1983
Asymptomatic Bacteriuric Elderly Women
Amer J Med, 1987
Residents with Chronic Catheterization
  • Bacterial colonization of residents with chronic
    indwelling foley catheters approaches 100,
    usually with 2-5 different organisms.
  • Indwelling catheters develop a biofilm on the
    interior of the catheters where the organisms
  • Urine cultures in chronically catheterized
    residents often reflect the bacteriology of the
    catheter biofilm not the bladder urine.

Treatment of Asymptomatic Bacteriuria in
Chronically Catheterized Residents
  • Asymptomatic bacteriuria is universal in patients
    with long term indwelling catheters.
  • Antimicrobial therapy will not prevent
    bacteriuria or symptomatic infection.
  • Antimicrobial therapy will lead to side effects,
    increasing resistance and cost.
  • Asymptomatic bacteriuria should not be treated.

How do I decide which resident to treat for
suspected UTI?
Is It a UTI ? No easy Answers.
  • For residents of LTCFs without a foley, 25-50
    of women and 15-40 of men have significant
    bacteriuria, but no symptoms.
  • At the same time, UTI is also the most common
    cause of bacteremia in LTCF residents.
  • Common cause of transfer to acute care
  • How do I separate the large number of
    asymptomatic patients with bacteria in their
    urine who dont need treatment from those with
    serious infections that need treatment?

Does Pyuria Help ?
  • 90 of residents with asymptomatic bacteriuria
    will have white blood cells in their urine
  • In fact, 30 of all residents without bacteriuria
    will have pyuria.
  • High rates are related to genital, bladder,
    prostatic or renal inflammation, usually
  • Absence of pyuria essentially excludes UTI, but
    the presence of white cells is not helpful.

Does Appearance or Smell Help ?
  • Foul smelling and cloudy urine have been used in
    the past to help determine who to treat.
  • Neither foul smell or cloudy urine have been
    clearly associated with symptomatic UTI.

Cloudy/Foul Smelling Urine
  • Nursing staff observes change in appearance or
    smell of urine (develop order set/policy)
  • Not an indication for urinalysis or culture if
  • Provide scheduled toileting q2-4 hours.
  • Gently cleanse perineum once daily and after each
    episode of incontinence.
  • Monitor closely for symptoms/change in mental
  • Khandelwal C. Annals of Long Term Care

Fever and Asymptomatic Bacteriuria
  • A common diagnostic dilemna is the presence of
    fever with no localizing findings in a resident
    with bacteriuria and pyuria.
  • Only 10 of these episodes are attributable to a
    urinary source in residents who do not have an
    indwelling foley catheter.
  • Orr P. Am J Med

Clinical Deterioration and UTI
  • UTI has been used as an explanation for
    nonspecific symptoms, such as
  • clinical deterioration
  • UTI was a cause of clinical deterioration in only
    11 of episodes.
  • If UTI was the cause, all were febrile.
  • Berman P. Age Ageing

Acute Change in Function and UTIs
  • An acute deterioration in stable chronic
    symptoms may indicate an acute infection.
    Multiple co-existing findings such as fever with
    hematuria are more likely to be from a urinary
  • In someone with nonspecific symptoms such as a
    change in function or mental status, bacteriuria
    alone does not necessarily warrant antibiotic
  • Although sepsis, including urosepsis, can cause
    dizziness or falling, there is not clear evidence
    linking bacteriuria or a localized UTI to an
    increased fall risk. F315

The Never Ending Dilemna
  • Clinically, the health care provider is faced
    with a difficult dilemna
  • Indwelling bladder catheters are the 1 risk for
    bacteremia in LTCFs, but
  • Essentially all urine cultures will be positive
    in residents with chronic catheterization.

Who Do You Treat ?
  • Urinalysis and urine culture are only really
    helpful if negative (excludes a UTI).
  • Fever is the most frequent clinical presentation
    of UTI in the chronically catheterized resident.
  • Catheter obstruction is often a precipitating
    event for fever and systemic infection.
  • Fever with hematuria or catheter obstruction has
    a high probability of being from a urinary source.

  • Because many residents have chronic bacteriuria,
    the research-based literature suggests treating
    only symptomatic UTIs.
  • Symptomatic UTIs are based on the following

F315 Indications to Treat a UTI
  • Residents without a catheter should have at least
    three of the following signs and symptoms
  • Fever (increase of gt2 degrees F/ rectal T gt99.5
    F/single T gt100 F).
  • New or increased burning, pain on urination,
    frequency or urgency.
  • New flank or suprapubic pain/tenderness.
  • Change in character of urine (new bloody urine,
    foul smell or amount of sediment) or lab report
    (new pyuria or microscopic hematuria).
  • Worsening of mental or functional status
    (confusion, lethargy, unexplained falls, recent
    onset incontinence, decreased activity or

F315 Indications to Treat a UTI
  • Residents with a catheter should have at least
    two of the following signs and symptom
  • Fever or chills.
  • New flank pain or suprapubic pain/tenderness.
  • Change in character of urine.
  • Worsening of mental status or function.
  • Local findings such as obstruction, leakage or
    mucosal trauma (hematuria) may also be present.

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How should I treat?Remove the Foley
catheter?Which antibiotic?
Catheter Change in Suspected UTI
  • If urine culture is obtained from the old
    catheter, culture is polymicrobial in 52 vs.
    only 11 after changing the catheter.
  • Patients who had catheter changes responded
    faster to treatment and had a lower relapse rate
    at 28 days (11 vs 41).
  • Raz R. J Urol

Treatment of Symptomatic UTI
  • When a patient has fever and the source is felt
    to be the urinary tract in a patient with a
    chronic Foley catheter, there is a more rapid
    response and a lower rate of recurrent symptoms
    if the Foley catheter is changed prior to
    initiation of antibiotics.
  • Suggests removal of the biofilm laden catheter is
  • Raz R. J Urol

Choosing Antibiotics for UTI
  • Be aware of local antimicrobial sensitivity
  • Balance efficacy and collateral damage
    (resistance, C. difficile, antibiotic side
  • Use of an antibiotic in the last 3-6 months
    increases the risk of resistance.
  • For acute cystitis, avoid antibiotics with gt 20
  • For pyelonephritis, avoid antibiotics with gt10
    expected resistance.
  • International Practice Guidelines for Rx of
    Uncomplicated Cystitis and Pyelonephritis.
    Clin Infect Dis 201152e103-e120.

Sentara Antimicrobial Resistance, 2011
  • E. coli
  • Ampicillin
    54 (40)
  • Ciprofloxacin 34
  • TMP/SMX 28
  • Nitrofurantoin 7
  • Ceftriaxone
  • Zosyn
  • Gentamicin 12
  • Meropenem 0
  • 2010 E. coli resistance for urine isolates,
    16-45 yo U.S. women

Predicting Resistance
  • 633 E. coli UTIs with 36 trimethoprim resistant
    and 12 ciprofloxacin resistant.
  • Odds of resistance increased with each TMP
    prescription in the preceding year one Rx 1.4
    fold, two 5-fold, three or more 6-fold.
  • Odds of resistance increased with each cipro
    prescription in the preceding year one Rx 3-
    fold, two or more 7-fold.
  • Vellinga A. J Antimicrob Chemother June 2012.

The More You Use It, The Faster You Lose It !
  • International Clinical Practice Guidelines
  • for the Treatment of
  • Acute Cystitis and Pyelonephritis
  • in Women
  • Gupta K. Clin Infect Dis 201152e103-e120.

Antibiotics for UTI
  • First-line therapy Cystitis/Bladder infection
  • Nitrofurantoin (Macrodantin, Macrobid, Furadantin
    susp) 100 mg twice daily for 5 days.
  • Common side effects N, V
  • Rare acute, subacute chronic pulmonary reactions
    1 or less/100,000.
  • Contraindicated for CrCl lt 60 (minimal levels in
  • Not used for pyelonephritis/possible urosepsis
    (low or undetectable serum levels).

Antibiotics for UTI
  • Trimethoprim-sulfamethoxazole DS one 160 mg-800
    mg tablet twice daily for 3 days.
  • One TMP 80 mg- SMZ 400 mg tablet twice daily for
    CrCl lt 30 not recommended for CrCl lt 15.
    (sulfamethoxazole may be subtherapeutic with
  • CrCl lt 50).
  • Trimethoprim 100 mg twice daily 100 mg every 18
    h for CrCl 30. (excellent levels in urine even
    with low CrCl).

Bactrim (TMP-SMZ) Resistance
  • 104 women with a TMP-SMZ resistant isolate who
    were treated with TMP-SMZ vs. 33 with a sensitive
  • Clinical success rate of TMP-SMZ was 54 if the
    isolate was resistant vs. 96 if the isolate was
  • Brown P. Clin Infect Dis
  • Urine concentrations of TMP are 100-fold higher
    than serum.

Fosfomycin (Monurol)
  • Phosphonic acid antimicrobial, bactericidal,
    inhibits peptidogylcan synthesis disrupting cell
  • Available as 3 gm packet, mixed in water, 50.
  • Very well tolerated, nausea is major side effect.
  • Long half life, dosing q2-3d.
  • Good tissue levels, excreted unchanged in urine,
    high levels in urine (100 ug for 48 hours).

Fosfomycin (Monurol)
  • Very broad spectrum VRE, MRSA, most GNR,
    including ESBL and KPC, but Pseudomonas and
    Acinetobacter usually resistant.
  • Approved for treatment of uncomplicated UTI
    (single dose 3 gm).
  • Off label use for complicated UTI (3 gm every 2-3
    days x 3 doses), prostatitis (3 gm q3d x 21

Antibiotics for UTI
  • Alternatives More resistance and collateral
    damage (C. difficle, MRSA colonization).
  • Ciprofloxacin hydrochloride 250 mg twice daily
    for 3 days 250 mg every 18 h for CrCl lt 30 250
    mg/d for CrCl lt 10.
  • Levofloxacin 250 mg/d for 3 days 250 mg every 48
    h for CrCl lt 20.

Quinolone and Tendon Rupture
  • 1,367 with achilles tendon rupture vs. 50,000
  • Risk increased 6.4-fold for 60-79 y.o. and
    20.4-fold for those gt 80 y.o. who used quinolones
    at a median of 7d.
  • 2 - 6 of all achilles tendon ruptures in people
    gt 60 y.o. can be attributed to quinolones.
  • Concomitant use of steroids significantly
    increased the risk in those gt 60 y.o. by 3-fold.
  • Van der Linden P. Arch Int Med

Quinolones and Retinal Detachment
  • 4,384 cases of retinal detachment vs. 43,840
    controls who had visited an ophthalmologist.
  • Current use of quinolones had a 4.5-fold
    increased risk of retinal detachment time to
    onset 5 days.
  • No association with recent or past use.
  • Absolute risk of 4 per 10,000 person years
    number needed to harm 2,500 for any use.
  • Estimated 1,440 cases of retinal detachment in
    the U.S. annually from quinolone use.
  • Etminan M. JAMA

Quinolones and Hepatitis
  • Trovafloxacin removed from the market for
  • 2009 European Medicines Agency called for
    restriction of moxifloxacin in rx of CAP 2010
    Health Canada released a warning for rare severe
  • Patients over 65 y.o. had a 2.2-fold and
    levofloxacin a 1.9-fold increased risk of
    admission for hepatotoxicity, 61 died during
    hospitalization. (8 cases/100K exposures).
  • No increased risk for ciprofloxacin.
  • Paterson J. CMAJ Aug

Ciprofloxacin Resistance
  • 87 adult patients with UTI with an organism
    resistant to ciprofloxacin who were treated with
  • 75 microbiologic cure, 77 clinical response.
  • Pseudomonas had a lower response than other
    pathogens (46 vs. 82).
  • Jeffries M. Ann Pharmacother
  • Levels of ciprofloxacin in urine are 100X gt than

Duration of Treatment
  • Most experts recommend that antimicrobial
    treatment should be for as short a period as
    possible 5-7 days for catheter associated UTI.
  • Rationale is to decrease emergence of resistance,
    but will also decrease cost.

  • Residents not requiring hospitalization
  • Ciprofloxacin 500 mg bid x 7 days.
  • If ciprofloxacin resistance exceeds 10, initial
    long acting parenteral antimicrobial (ceftriaxone
    1 gm or single daily dose aminoglycoside
    (gentamicin or tobramycin 4-7 mg/kg q24h).
  • Tailor antibiotics according to sensitivity.
  • Duration 10-14 days

Should I do a test of cure culture?
F315 Follow-Up of UTIs
  • The goal of treating a UTI is to alleviate
    systemic or local symptoms, not to eradicate all
    bacteria. Therefore, a post-treatment culture is
    not routinely necessary but may be useful in
    certain situations.
  • Continued bacteriuria without residual symptoms
    does not warrant repeat or continued antibiotic

Exception for Follow Up Culture
  • If the resident is in contact isolation because
    of a resistant organism, such as an extended
    spectrum beta lactaamase (ESBL) producing E. coli
    or Klebsiella or another highly resistant gram
    negative rod (such as Acinetobacter), MRSA, or
    VRE, then a negative culture is required to
    remove them from contact isolation.
  • If the repeat urine culture is positive,
    treatment is only indicated if the resident is
  • Retreatment is not used to eradicate colonization
    or in an asymptomatic resident.

Clostridium difficile Infection
  1. Surveillance definition
  2. Diagnosis and treatment of infection

CDI and Health Care
  • 300,000 annual cases of healthcare associated CDI
    each year at a cost of 3.2 billion.
  • 20 of hospital onset CDI occurred in residents
    of nursing homes.
  • 67 of nursing home onset CDI occurred in
    patients recently discharged from an acute care
  • Antibiotic use increases the risk of CDI 10-fold
    while the patient is taking antibiotics and for
    one month after stopping and 3-fold for the next
    2 months.
  • MMWR 201261157-62.

Clostridium difficile Infection
  • Most common cause of hospital acquired diarrhea
    due to an infectious cause.
  • 100 increase in cases and a 400 increase in
    mortality in the last decade.
  • 90 of deaths are in persons gt 65 y.o.
  • Redelings M. Emerg Infect Dis

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Epidemic C. difficile Strain
  • Epidemic C. difficile strains have acquired
    resistance to fluoroquinolones.
  • Ciprofloxacin was the antibiotic associated with
    the highest risk of developing CDI (3.4-fold).
  • In Quebec, 55 of CDI patients had received a
  • Pepin J. Clin Infect Dis

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CDI and PPIs
  • Gastric acidity is natures disinfectant,
    killing vegetative C. difficile, Shigella,
    Salmonella and Vibrios.
  • Dial found a strong association with PPI use (OR
    3.5) among outpatients, but none with H2 receptor
    antagonists. CMAJ 206175745-48.
  • Lowe found no correlation with PPIs in
    hospitalized patients after adjusting for other
    medications and comorbidity. Clin Infect Dis
  • 2/2012 FDA safety notice on risk of CDI with

CDI Surveillance Definition
  • Clostridium difficile infection (both criteria 1
    and 2 must be present)
  • Criteria1. One of the following.
  • Diarrhea 3 or more liquid or watery stools above
    what is normal for the resident within a 24-h
  • Presence of toxic megacolon (abnormal dilatation
    of the large bowel, documented radiologically).

CDI Surveillance Definition
  • Criteria 2. One of the following
  • Stool sample yields a positive laboratory test
    result for C. difficile toxin A or B, or a
    toxin-producing C. difficile organism is
    identified from a stool sample culture or by a
    molecular diagnostic test such as PCR.
  • Pseudomembranous colitis is identified during
    endoscopic examination or surgery or in
    histopathologic examination of a biopsy specimen.

CDI Surveillance Definition
  • Primary episode of C. difficile infection is
    defined as one that has occurred without any
    previous history of C. difficile infection.
  • or has occurred gt 8 weeks after the onset of a
    previous episode of C. difficile infection.

CDI Surveillance Definition
  • Recurrent episode of C. difficile infection is
    defined as an episode that occurs 8 wk or sooner
    after the onset of a previous episode, provided
    that the symptoms from the earlier (previous)
    episode have resolved.
  • Individuals previously infected with C. difficile
    may continue to remain colonized even after
    symptoms resolve.

CDI Clinical
  • Broad range from mild self limited diarrhea to
    colitis with or without pseudomembranes to
    fulminating colitis with toxic megacolon.
  • Bloody diarrhea is uncommon (5-10) only 25
    have occult blood fecal leukocytes in 28-40.
  • Fever is noted in 30-50 usually low but can be
    as high as 106 degrees F.

CDI Diagnosis
  • Leukocytosis and hypoalbuminemia are very
  • In one study, the mean WBC with CDI was 15,800
    with 26 having a WBC gt20K and 6 gt30K.
  • For all patients with WBC gt30,000 who do not have
    a hematologic malignancy, 25 have CDI.
  • Wanahita A. Clin Infect Dis

The Nose Knows
  • Urban legend exists among nurses that they can
    accurately diagnose CDI on smell alone.
  • Study of 138 nursing staff sensitivity was 55,
    but NPV was 92 overall accuracy was 79.
  • Nurses were able to exclude a diagnosis of CDI
    with a high degree of confidence and accuracy.
  • Burdette S. CID 2007441142.
  • May lead to a new certification AOCDCRN
  • (advanced olfactory C. difficile certified

  • Enzyme immunoassay for C. difficile toxin is
    rapid and less expensive than other tests.
  • Reported sensitivity is 75-85 (in a study from
    Johns Hopkins, sensitivity was only 40).
  • Test only on specimens that take the shape of the
    container 13 of liquid specimens were toxin
    (), 17 of soft were ().

C. Diff x 3 Dont Do It
  • Repeated assays may account for 36 of all tests
    ordered, but only 1 of positive assays.
  • Renshaw A. Arch Pathol Lab Med
  • Repeat assays represented 17 of all assays, only
    1 () at a cost of 128/assay.
  • Mohan S. Am J Med

EIA Repeat Testing
  • Testing 1,000 patients with prevalence of 10 and
    sensitivity of 73, specificity 98.
  • True Positive False Positive
  • First 73 24
  • Second 18 9
  • Third 7 21
  • Peterson L. Ann Intern Med

  • No indication for serial monitoring or
    end-of-treatment-test-of-cure 1/3 have a
    positive toxin assay at the end of successful
  • Bartlett J. NEJM
  • Stool carriage may persist for 3-6 weeks after
    successful treatment and has not been found to
    predict relapse.
  • Issack M. Lancet

CDI Treatment Basics
  • Stop the offending antibiotic.
  • Up to 25 will resolve spontaneously, observation
    alone may be adequate.
  • If antibiotics can not be stopped, change to
    lower risk antibiotics. (aminoglycosides,
    sulfonamides, macrolides, and tetracyclines).
  • Avoid antimotility agents.
  • Novak E. JAMA
  • Opiates may prevent diarrhea, obscuring the

Metronidazole vs. Vancomycin
  • Metronidazole has been the preferred drug because
    of risk of VRE and the cost.
  • No patients developed VRE in a study of 20
    patients treated with oral vancomycin.
  • Selgado, C. Infect Control Hosp Epidemiol
  • .But vancomycin capsules 125 mg qid are 36.80
    each AWP (60-120/day retail) vs. 2.19/day for
    metronidazole 500 mg tid. (most facilities use
    the intravenous powder compounded in a flavored
    solution lt 5.00/day).

CDI Vancomycin
  • Vancomycin has been called a pharmacologic
  • You put it in the mouth and it all winds up in
    the colon.
  • Very minimal absorption with stool levels of
    gt1000 ug/ml, which exceeds the MIC by 1000-fold.
  • Cure rates have been 86-99 relapse rates of
  • Dose of 125 mg qid po has been shown to be as
    effective as 500 mg qid.
  • Reserved for metronidazole failures (no response
    at 3-5 days) or severe CDI.

SHEA/IDSA Guidelines for CDI
  • Mild Moderate WBC lt15,000 lt 50 increase in
    Cr from baseline.
  • Severe WBC gt/ 15,000 or 50 increase of Cr
    from baseline.
  • Severe complicated severe disease plus ICU
    admission, need for colectomy, ileus, toxic
    megacolon, hypotension, colonic perforation.
  • Cohen S. Infect Control Hosp Epidemiol.

CDI Treatment
  • Mild Moderate oral metronidazole 500 mg tid.
  • Severe oral vancomycin 125 mg qid
  • Severe complicated high dose oral vancomycin 500
    mg qid by nasogastric tube if necessary and/or
    metronidazole IV 500 750 mg q8h.
  • For complete ileus, IV metronidazole plus
    vancomycin by retention enema.

  • Fidaxomycin is a macrocyclic antibiotic with
    minimal absorption and high fecal levels.
  • Bactericidal against C. difficile and 8-fold
    more active than vancomycin, which is
  • Minimal activity against fecal flora, especially
    Bacteroides sp., while vancomycin has significant
    activity against Bacteroides sp.

  • Randomized to fidaxomicin vs. vancomycin with 92
    vs. 90 clinical cure.
  • Recurrence of infection was 15 for fidaxomicin
    vs. 25 for vancomycin, overall.
  • No difference in recurrence with epidemic strain,
    but for the 64 of patients with other strains
    there was a 69 reduction in recurrence.
  • Louie T. NEJM 2011364422-31.

Cost of CDI agents
  • Fidaxomicin 200 mg bid 140./dose

  • 2,800. for 10d
  • Metronidazole 500 mg tid .20/dose

  • 6 for 10d
  • Vancomycin caps 125 mg qid 30.00/dose

  • 1,273. for 10d
  • Vancomycin injection given po 1.68/dose

  • 67. for 10d

CDI Relapse
  • Recurrence after initial resolution of symptoms
    occurs in 20-25 after initial episode, usually
    within 5-8 days, but may be delayed for weeks to
  • Risk for recurrence gt 65 y.o., comorbidities,
    another antibiotic course, prior recurrence (up
    to 45 risk).

Early Preventative Therapy
  • Treatment of persons known to be colonized or a
    recent episode of CDI who require antibiotic
  • Despite the absence of guidelines for this
    approach, there is remarkable homogeneity in that
    clinicians who practice this prophylactic
    strategy use oral metronidazole or vancomycin
    during the entire course of antimicrobial therapy
    and for an additional 7 days after the end of its
  • Miller M. Clin Infect Dis

CDI Relapse
  • First recurrence Repeat a course of the initial
    antibiotic used, usually metronidazole.
  • Second or more vancomycin preferred (not
    absorbed, high stool levels) over metronidazole
    (readily absorbed, stool levels decrease with
    decreasing inflammation, undetectable when
    diarrhea resolves).
  • Vancomycin often tapered and pulsed.

CDI Relapse
  • Oral vancomycin with taper and pulsed dosing at
    125 mg qid for 7 days, tapering to bid for 7
    days then daily for 7 days. Tedesco F. Am J
    Gastro 198580867-8.
  • Followed by pulsed dosing, which allows for
    germination of residual spores during days off,
    followed by killing of the vegetative form when
    vancomycin is given again.
  • Give vancomycin 250 mg every 2-3 days for 3
    weeks others gradually lengthen pulsing interval
    to once every 10 days. Surawicz C. Nat Clin Pract
    Gastro Hepatol 2004132-8.

Probiotic Problems
  • High of patients receiving antibiotics (2/3)
  • (can not use vancomycin rapidly kills
  • Doses and products vary results are specific to
    species and number of viable cells.
  • Maximum viable cells at end of manufacture
    minimum number at end of shelf life, number that
    transit to colon differ.

Probiotics Saccharomyces
  • McFarland in a double-blind, randomized, placebo
    controlled trial of S. boulardii found no
    decrease in initial recurrence, but found a 50
    reduction in further recurrences (35 vs. 65, p
  • McFarland L. JAMA 19942711913-18.
  • Surawicz conducted a second study with S.
    boulardii which confirmed a decrease in
    recurrences only with high dose vancomycin (500
    mg qid), but no effect with metronidazole or
    vancomycin 125 mg qid.
  • Surawicz C. Clin Infect Dis

CDI Recurrences
  • Stool transplantation from a donor administered
    via nasogastric tube or colonoscope.
  • Donor usually spouse.
  • Lacks aesthetic appeal, but appears to be highly
    effective (92).
  • Toying with Human
  • Borody T. J Clin Gastroenterol

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CDI Prevention
  • Numerous hospital and nursing home outbreaks have
    been reported. Johnson S. NEJM
  • C. difficile spores can persist in the
    environment for months on floors, bedding and
  • 59 of HCW caring for patients with CDI had C.
    difficile cultured from their hands, including
    75 of physicians. McFarland L. NEJM

CDI Prevention
  • Private room in contact isolation or cohort.
  • Gloves have been clearly shown to decrease
    acquisition of C. difficile by HCW and decrease
    the incidence of CDI. Johnson S. Am J Med
  • Avoid rectal thermometers.
  • Neither soap water or alcohol products can kill
    the spore form of C. difficile, but soap water
    can remove the spores from the hands.
  • Most effective surface cleaning is with bleach.

Bleach Decontamination
  • Decontamination with a bleach spray with 500 ppm
    resulted in a 79 reduction in the number of ()
    surface cultures. Katz G. Am J Epidemiol
  • Switch from a quarternary ammonium to a 110
    hypochorite solution for disinfection of rooms
    for patients with CDI resulted in a 63 reduction
    in CDI cases. Mayfield J. Clin Infect
    Dis 200031995-1000.
  • Figueroa reported a 68 decrease in HCA CDI,
    despite stable CDI admission rates, after change
    to a universal bleach-based cleaning protocol was
    introduced for all hospital discharges.
    45th IDSA Oct 2007. Ab3 LB-6

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  • gt80 of all SSTIs are caused by MRSA.
  • Most spider bites are MRSA.
  • Incision and drainage (ID) alone may be adequate
    for uncomplicated abscesses.
  • Antibiotics alone are not adequate for fluctuant
  • For patients with suspected CA MRSA, it is
    important to obtain specimens for culture and
    sensitivity (CS).

CA MRSA and Antibiotics
  • 531 episodes of CA MRSA SSTI, 75 abscesses.
  • 8 had treatment failure (repeat ID, new abscess
    while on Rx, hospitalization).
  • Failure to start active antibiotic within 48
    hours of initial ID was the only variable
    associated with treatment failure (OR 2.8) or 95
    vs. 87 success.
  • Ruhe J. Clin Infect Dis

CA MRSA Treatment
  • Trimethoprim-sulfamethoxazole (Septra, Bactrim)
    is a reasonable choice.
  • Can add rifampin 300 mg bid or 600 mg qd, but
    never use rifampin alone (rapid resistance).
  • If ciprofloxacin or another quinolone is used,
    combine with rifampin to prevent the emergence of
  • Doxycycline or minocycline may be of value.
  • Medical Letter

MRSA Colonization in LTCF
  • Point prevalence studies in VA units found 25-35
    of residents are positive at any given time.
  • In areas where MRSA is common, 9-12 of residents
    in free standing LTCF are colonized.
  • 65 are colonized for a long time, the remainder
    have transient colonization.

MRSA and the LTCF
  • Patients generally acquire MRSA in the acute care
  • Transmission from resident to resident in the
    LTCF is infrequent, although occasional outbreaks
    have been described.
  • Environmental cultures from common areas are
    seldom positive, although the residents immediate
    environment is commonly positive.
  • Prevalence of colonization may be high, but
    infection is uncommon.

Frequency of MRSA Colonization at Various
Patient Body Sites
Forehead 51 Nose 54 -
93 Neck 35 Axilla
13 - 28 Hands 40 Groin
30 - 39
95 of nasal carriers had MRSA at
extranasal sites
Hill RLR et al. JAC 198822377 Sanford MD et al.
CID 1994
Rohr U et al. Int J Hyg Environ Health
MRSA and Isolation
  • Most Desirable Private room or cohorting with
    another person who is colonized with MRSA.
  • Less Desirable Room with a resident who has
    intact skin and no tubes (PEG, trach, IV,
  • Should not be placed with resident who has
    another resistant organism (i.e. VRE).

MRSA Colonization and Activities
  • Resident may attend activities as long as
  • Any colonized or infected site can be securely
  • Resident can observe acceptable hygiene and wash
    his/her hands.
  • Resident with MRSA in sputum does not need to
    wear a mask if he/she can cover mouth and nose
    with tissue when coughing.
  • Resident who cannot control secretions should not
    attend group activities.

MRSA and the LTCF
  • Intensive barrier and isolation precautions have
    not been shown to be more beneficial than gloving
    and hand washing.
  • Decolonization efforts are usually ineffective
    and have not decreased infections.
  • Generalized screening is not justified.
  • No evidence to support non-admission of patients
    from acute care facilities.

MRSA Infection Control
  • Staff should use Contact Precautions
  • Handwashing After removing gloves, before
    leaving the room.
  • Gloves When physical contact with resident is
  • Gowns Substantial contact of clothes with
    patient or environmental surfaces or ileostomy,
    colostomy, diarrhea, incontinence, or wound
    drainage that is not contained.
  • Masks When splashes possible (suctioning/irrigati
  • No special cleaning of rooms required.

  • LTCF should not refuse placement if room
    available (single, cohort or low risk resident).
  • Leads to overuse of hospital resources and a
    false sense of security for LTCF management.
  • MRSA patients in hospitals or LTCF do not need
    two negative cultures for MRSA prior to transfer,
    decolonization prior to transfer should not be
  • Inform hospitals or other LTCF of MRSA status on

Termination of Isolation at the LTCF
  • 2 cultures of colonized or infected site are
    negative, one week apart.
  • First culture should be taken at least 72 hours
    after antibiotic treatment has been stopped.
  • If sputum cannot be obtained, throat swab may be
  • If wound is healed, healed site may be cultured
    with moist swab.

Nares Cultures
  • Do not obtain nares cultures when obtaining
    cultures at other body sites.
  • Nares cultures are not needed to discontinue
    contact precautions.
  • Nares cultures only used if resident is
    implicated in MRSA outbreak.
  • Decolonization of nares is not routinely

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Metronidazole vs. Vancomycin
  • First randomized, double-blind, placebo
    controlled trial of metronidazole vs. vancomycin.
  • Stratified by Scoring System at study entry into
    mild and severe disease.
  • Zar F. Clin Infect Dis

CDI Severity Scoring System

  • Points
  • Age gt 60 y.o.
  • Temp gt 38.3 C 1
  • Albumin lt 2.5 mg/dl 1
  • WBC gt 15,000 1
  • Rx in ICU
  • Pseudomembranes 2
  • Mild 0-1, Severe 2 or more.

CDI Outcomes Clinical Cure
  • Metronidazole
  • Mild CDI 90
  • Severe CDI 76
  • Recurrences 15
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