A 10-year-old horse from north Pasco has been euthanized after getting West Nile virus.
PASCO, WA – A 10-year-old horse in Franklin County is the second case of equine West Nile virus reported in Washington for the
The horse in north Pasco has since been euthanized.
horse was not vaccinated for the disease, and had not left the state. West Nile
is potentially fatal in infected equines, other mammals and birds. The
Washington State University's Animal Disease Diagnostic Laboratory in Pullman
reported the positive test results to the State Veterinarian's Office earlier
only other confirmed case of West Nile virus in a Washington horse this year was
reported in late September for a horse pastured in Outlook, Yakima County.
frost will reduce the likelihood of further cases for the year," said Acting
State Veterinarian Paul Kohrs. "Horse owners in areas of the state where this
disease will overwinter should consider vaccinating for West Nile in 2014 at
least a month before the onset of the mosquito season."
Nile virus is spread by mosquitoes that have fed on infected birds. The disease
sickens people, horses, birds and other animals, but it does not spread from
horses to people or other animals.
Nile virus is fatal to horses in about a third of the cases where clinical signs
are apparent, although most horses do not become ill and show no symptoms at
all. Horses that
do become ill often display loss of coordination, loss of appetite, confusion,
fever, stiffness, and muscle weakness, particularly in their
had 72 West Nile virus cases in horses in 2009, but none in 2010 or 2011. Last
year, a horse pastured near Grandview was euthanized after it became ill with