West Nile Fever: Causes, Symptoms, Daignosis, Prevention and Treatment - PowerPoint PPT Presentation

View by Category
About This Presentation
Title:

West Nile Fever: Causes, Symptoms, Daignosis, Prevention and Treatment

Description:

West Nile Fever is a zoonotic disease which is a flavivirus related to the viruses that cause St. Louis encephalitis, Japanese encephalitis, and yellow fever. – PowerPoint PPT presentation

Number of Views:66

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: West Nile Fever: Causes, Symptoms, Daignosis, Prevention and Treatment


1
West Nile Fever
2
West Nile Fever
  • West Nile fever is a zoonotic disease (an animal
    disease affecting humans). Disease is caused by
    West Nile virus (WNV), which is a flavivirus
    related to the viruses that cause St. Louis
    encephalitis, Japanese encephalitis, and yellow
    fever.West Nile virus is mainly transmitted to
    people through the bites of infected mosquitoes.
    West Nile virus (WNV) is maintained in nature by
    transmission between birds and mosquitoes as
    birds are the natural hosts of the virus. Humans,
    horses and other mammals can be infected.West
    Nile fever can cause severe neurological illness
    and death in people, however about 80 of people
    who are infected show no symptoms.

3
Causes of West Nile virus (WNV)
  • West Nile fever is caused by West Nile virus
    (WNV), belongs to the Japanese encephalitis virus
    (JEV) antigenic complex under family
    flaviviridae.Transmission of disease West
    Nile virus is happened in natural cycle that
    involves transmission between birds and
    mosquitoes. Humans, horses and other mammals can
    be infected.Birds acts both as carriers and
    amplifying host for West Nile virus. Some bird
    species especially the crow family (corvidae) are
    more susceptible to the virus than others.
    Migratory birds are important in West Nile virus
    transmission.

4
Causes of West Nile virus (WNV)
Continue
  • When mosquitoes feed on an infected bird they
    become infected with the virus. The mosquitoes
    play their role as carriers by spreading the
    virus from an infected bird to other birds and to
    other animals. West Nile virus is maintained in
    mosquito populations by transferring the
    infection through adults to eggs.Infection of
    other animals (e.g. horses, and also humans) is
    incidental to the cycle in birds since most
    mammals do not develop enough viruses in the
    bloodstream to spread the disease. They are
    dead-end hosts.  The virus can be transmitted
    through a direct contact with other infected
    animals, their blood, or other tissues.A small
    proportion of human infections may be transmitted
    from organ transplant, blood transfusions and
    breast milk of infected person.

5
Diagnosis of West Nile virus (WNV)
  • Various diagnostic tests are-
  • (ELISA) IgM can be determined from cerebrospinal
    fluid (CSF) and serum specimens received from
    West Nile virus infected patients at the time of
    their clinical presentation. Serum IgM antibody
    can persist for more than a year.
  • IgG antibody sero-conversion in two serial
    specimen collected at a one week interval by
    enzyme-linked immunosorbent assay (ELISA)
  • Viral detection by reverse transcription
    polymerase chain reaction (RT-PCR) assay, and
  • Virus isolation by cell culture.

6
Symptoms of West Nile virus (WNV)
  • The incubation period (the period between
    exposure to an infection and the appearance of
    the first symptoms) of West Nile fever is usually
    3 to 14 days.20 of people who become infected
    with West Nile Virus will develop West Nile fever
    whereas about 80 of infected people are
    asymptomatic (show no symptoms).Some of the
    symptoms of West Nile fever involve Fever,
    headache, tiredness, and body aches, nausea,
    vomiting, sometimes skin rash and swollen lymph
    glands.

7
Symptoms of West Nile virus (WNV)
Continue
  • Severe disease such as West Nile encephalitis or
    meningitis (inflammation of brain and surrounding
    tissues) show symptoms of headache, high fever,
    neck stiffness, stupor, disorientation, tremors,
    coma, convulsions, muscle weakness and
    paralysis.Serious illness can occur in people
    of any age however people over the age of 50 and
    some immune-compromised persons (such as person
    who has received organ transplant) are at greater
    risk of serious illness.It takes several weeks
    or months to recover from serious illness. Some
    of the neurologic effects may be permanent
    resulting in long-term sequelae or death.About
    10 of patients with neurologic complications
    may die.

8
Treatment of West Nile virus (WNV)
  • Specific antiviral treatment for West Nile virus
    infection is not available. In mild infection
    pain relievers can be used to reduce
    fever.Treatment is supportive involving
    hospitalization, intravenous fluids, respiratory
    support, and prevention of secondary infections
    for the patients who are suffering with
    neuro-invasive west Nile virus infection. No
    vaccine is available for humans.

9
CONNECT WITH US
  • Logon to
  • www.lazoi.com
  • Like us on Facebook
  • https//www.facebook.com/LazoiTheLife
  • Follow us on Twitter
  • https//www.twitter.com/lazoithelife
  • Follow us on Pinterest
  • https//www.in.pinterest.com/lazoithelife
About PowerShow.com