WNV is maintained in nature in a transmission cycle between birds and mosquitoes. Horses are a species that is susceptible to infection with the virus. In 1999 it made its way to the United States, and has become established across North America. The American Association of Equine Practitioners (AAEP) recommends incorporation of a WNV vaccine as an annual core vaccine in equine vaccination protocols. West Nile Virus Fact Sheet Sponsored by: West Nile virus (WNV) spread rapidly after its introduction in 1999; vaccination is recommended Horses should be vaccinated against West Nile virus according to guidelines approved by the Ameri-can Association of Equine Practitioners. It occurs naturally in parts of Africa, Asia, the Middle East, Europe, North America, … Confirmation of West Nile Fever requires laboratory testing.We are switching from paper accession forms to an online ordering system which will expedite the sample testing process.This 4-step submission process will take you through a series of questions to ensure all required information is provided, so when your package arrives, samples are moved quickly to their testing section(s). The Centers for Disease Control and Prevention have predicted that the West… WNV is now endemic in California.The following chart summarizes the annual confirmed equine WNV clinical cases and the numbers of horses that died or were humanely euthanized in California since 2003.

West Nile Fever (also known as West Nile encephalitis) is an inflammation of the central nervous system that is caused by infection by West Nile Virus (WNV). Collaborating agencies use the surveillance information to focus disease control efforts.In October 2003, WNV was first-diagnosed in California in 20-year old unvaccinated Missouri Fox Trotter. West Nile Virus. Because it is impossible to distinguish between vaccinated and naturally infected horses with current testing methods, it is important that vaccination records be kept updated for each are: Veterinarians who diagnose potential West Nile virus cases should contact the State Veterinarian’s Office at (360) 902-1878 or Additional information about West Nile Fever can be found at: It’s important for veterinarians to work with horse owners this time of year to prevent, detect and accurately diagnose a potential infection. In 2004, California became the disease epicenter with 540 confirmed equine clinical cases of WNV. The virus is maintained in the wild bird population and is spread between birds by mosquitos. For horses exhibiting clinical signs of WNV, the case fatality rate is approximately 33%; however, many infected horses will fully recover following infection.Vaccination and mosquito control minimize the risk of WNV infection in horses.

Birds are considered the natural reservoir for WNV since high levels of virus circulate in their bloodstream.

WNV was first identified in the U.S. in 1999 in New York State and is currently found across the continental U.S.People and animals can become infected from the bite of certain kinds of mosquitoes that are infected with the virus. ST e PH an I e l. CH ur CH West Nile Virus. to reduce the infection potential in humans, horses, and other animals.A WNV vaccine for horses is readily available from your veterinarian. concerned that your horse may be exhibiting signs of encephalitis, please contact your veterinarian.A tentative diagnosis of West Nile Fever as a cause of neurological disease in horses is based upon clinical signs as described above. Currently, there are four United States Department of Agriculture (USDA)-licensed WNV vaccines available for horses in the U.S. Methods to eliminate mosquito breeding sites include:WNV surveillance includes testing samples from dead birds, sentinel chickens, mosquito pools, horses and humans. In horses that do become ill, the virus infects the central nervous system and may cause As of 2015, more than 27,000 horses in the U.S. have been infected since the disease was first identified. West Nile virus has infected more than 25,000 horses since its 1999 entrance into the United States. horse that receives the vaccine. West Nile Virus (WNV) is a mosquito-borne virus first detected in the United States (U.S.) in the New York City area in 1999.

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