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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 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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