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Mycobacterium florentinum, a new species isolated from humans

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Title: Mycobacterium florentinum, a new species isolated from humans


1
Mycobacterium florentinum, a new species
isolated from humans
  • Enrico Tortoli
  • European Society of Mycobacteriology Alghero,
    June 30, 2004

2
M. simiae-related mycobacteria
  • Slow growth
  • Short helix 18 in the 16S rDNA
  • Known organisms
  • until 1993 M. simiae
  • 2004 13 species

3
The strains
  • 1. isolated twice from the sputum of an elderly
    patient with lung cancer
  • 2. isolated twice from the sputum of an elderly
    patient with hemoptysis
  • 3. isolated from the stools of an AIDS patient
  • 4. isolated from the excised lymph node of a
    child with cervical lymphadenitis
  • 5. isolated three times from the sputum of an
    elderly patient with pulmonary disease
  • 6. isolated four times from the sputum of a
    patient, long hospitalized in intensive care due
    to pneumonia imputed to pneumococcus
  • 7. isolated twice, at four year interval, from
    the sputum of an elderly woman with fibrosis and
    bronchiectasis

4
The strains
  • 1. isolated twice from the sputum of an elderly
    patient with lung cancer
  • 2. isolated twice from the sputum of an elderly
    patient with hemoptysis
  • 3. isolated from the stools of an AIDS patient
  • 4. isolated from the excised lymph node of a
    child with cervical lymphadenitis
  • 5. isolated three times from the sputum of an
    elderly patient with pulmonary disease
  • 6. isolated four times from the sputum of a
    patient, long hospitalized in intensive care due
    to pneumonia imputed to pneumococcus
  • 7. isolated twice, at four year interval, from
    the sputum of an elderly woman with fibrosis and
    bronchiectasis

5
Biochemical and cultural features
  • Growth at 25-37C in two weeks
  • Colonies smooth, creamy, nonchromogenic
  • Positive biochemical tests urea hydrolysis,
    tellurite reduction
  • Negative biochemical tests niacin, Tween 80
    hydrolysis, 3-d arylsulfatase, ß-glucosidase
  • Variable biochemical tests nitrate reduction,
    semiquantitative catalase
  • Growth inhibited on Mac Conkey agar, 5 NaCl
    Lowenstein Jensen
  • Growth not inhibited on p-nitrobenzoate,
    isoniazid, hydroxylamine and oleate

6
GLC pattern
M. lentiflavum
M. triplex
FI-93171
240 gt 260
200 gt 220
180 gt TBSA
7
HPLC pattern
M. simiae
FI-93171
8
HPLC pattern
9
Antimicrobial susceptibility
  • Full susceptibility to clarithromycin and
    clofazimine only
  • High MICs of quinolones and rifamycins

10
Genetic sequencing
 
 
 
  • 16S rDNA 8 nucleotide mismatch with M. triplex
  • ITS 14 nucleotide mismatch with M. triplex

11
Phylogenetic tree
FI-93171
12
PRA patterns
BstE III
Hae III
Haa I
1 2 3
1 2 3
1 2 3
1. FI-93171 2. M. lentiflavum 3. M. triplex
13
A previous report
14
M. florentinum sp. nov.
  • Most closely related species
  • M. triplex
  • M. lentiflavum

15
M. florentinum sp. nov.
  • Most closely related species
  • M. triplex
  • M. lentiflavum

16
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17
Contributors
Carlo Garzelli Laura Rindi Department of
Experimental Pathology, University of Pisa,
Pisa, Italy Nalin Rastogi K. S. Goh TB and
Mycobacteria Unit, Institut Pasteur of
Guadeloupe, Pointe a Pitre, Guadeloupe,
France Gianna Mazzarelli Alessandro
Mariottini Laboratory of Microbiology, Careggi
Hospital, Florence, Italy Pirjo
Torkko Laboratory of Environmental Microbiology,
National Public Health Institute, Kuopio, Finland
Marija-Leena Katila Department of Clinical
Microbiology, Kuopio University Hospital, Kuopio,
Finland
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