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October 2012

Case of the MonthhQp://i.usatoday.net/news/_photos/ 2011/01/05/blackbirdsx.jpghQp://coloradodisasterhelp.colostate.edu/prefair/images/Dz/wnvsling.jpg

  • On
    July
    5,
    many
    birds
    were
    found
    dead
    in
    a
    park
    that
    had
    hosted
    a
    Fourth
    of
    July
    celebraAon
    the
    night
    before.
    The
    birds
    were
    assumed
    to
    be
    dead
    because
    of
    fireworks
    from
    the
    night
    before.
  • A
    week
    later,
    a
    veterinarian
    was
    called
    to
    a
    local
    horse
    stable.
    About
    10%
    of
    the
    horses
    showed
    signs
    of
    ataxia
    and
    muscle
    fasciculaAon.
    Some
    were
    recumbent.
  • Three
    horses
    (30%
    case-­‐fatality)
    died
    and
    a
    post-­‐mortem
    examinaAon
    was
    performed.
    Brain
    and
    spinal
    cord
    Assue
    were
    submiQed
    for
    immunohistochemistry
    based
    off
    of
    a
    clinical
    suspicion
    from
    management
    pracAces.
  • IHC
    was
    posiAve
    for
    West
    Nile
    Virus.
  • SupporAve
    therapy
    and
    isolaAon
    of
    infected
    horses
    was
    implemented.
  • The
    remaining
    clinical
    horses
    recovered

Differentials

Question

Differential diagnoses for neurological signs in horses include all the following except...

  1. Western Equine Encephalitis
  2. Equine Protozoal Myeloencephalitis
  3. Equine Herpes Virus
  4. Rabies
  5. All of the above are appropriate differentials for neurological signs

Control and Preventionwww.giantmicrobes.com

Question

The single best strategy for preventing West Nile cases in horses is...

ZoonosisWest Nile Virus

Question

Most humans infected with West Nile Virus have what symptoms?

  1. Encephalitis
  2. Mild flu-like symptoms
  3. No symptoms
  4. Respiratory distress

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