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West Nile Virus in the San Gabriel Valley: West Nile Virus Facts Jump to: History, WNv in California, Transmission & Symptoms, WNv Surveillance/Precautions/Control Illness caused by West Nile virus (WNV) infection has been confirmed by the USDA's National Veterinary Services Laboratories (NVSL) and causes nearly 30% fatality in non-vaccinated horses. Vaccines are available for horses: two shots given 3-4 weeks apart are recommended with annual or bi-annual boosters as determined by veterinarian. Additional Information may be found at: http://www.cdfa.ca.gov/ahfss/ah/wnv_info.htm 138 species of birds have tested positive for West Nile virus The most severe illnesses and largest numbers of deaths have been reported among crows and other corvid species (ravens, jays, magpies) For a complete list of bird species testing positive for WNV, please visit: http://www.cdc.gov/ncidod/dvbid/westnile/birdspecies.htm
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