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Jump to: History, West Nile virus in the U.S., Equine Disease & Avian Disease, WNv in California, Transmission & Symptoms, Press Releases, WNv Surveillance/Precautions/Control 2002: First found in CA in 2002 – LA County woman contracted WNV although no evidence of WNV was found in birds, mosquitoes, or sentinel chickens in CA. 2003: First identified in June from mosquitoes in Imperial County. WNV First identified in the San Gabriel Valley in crow collected from the city of Arcadia in September. 2004: First crow collected February 24 from city of San Gabriel. Mild winter, late spring rains followed by high temperatures spiked early season WNV transmission. 830 human WNV infections and 28 deaths were reported in California in 2004. 2005: Unusually high rains have caused concern for California. Early reports of birds and mosquitoes infected with West Nile virus have occurred throughout Northern and Southern California. 935 human infections and 19 deaths were reported in California in 2005. 2006: A milder year across California. 292 human infections and 7 deaths were attributed to WNV. 2007: Increased WNV activity and predictions of epidemic transmission levels prompt Governor Schwarzenegger to issue WNV State of Emergency in CA on August 2. Updates for California can be found at: http://westnile.ca.gov
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