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| Public Information and Resources
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| Professional Resources
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West Nile virus has been detected in 54 / 58 California Counties in 2006.
- 276 human cases from 36 counties have tested positive for WNV in 2006.
- There have been seven WNV-related fatalities reported in California from Butte (2), Contra Costa (2), Fresno (1), Riverside (1), and Shasta (1) counties in 2006.
- 58 horses from 23 counties have tested positive for WNV in 2006.
- 1,446 dead birds from 53 counties have tested positive for WNV in 2006.
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- 832 mosquito samples from 34 counties have tested positive for WNV in 2006.
- 640 sentinel chickens from 29 counties have tested positive for WNV in 2006.
- 32 squirrels from 9 counties have tested positive for WNV in 2006.
* Horse data is only updated on Fridays
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A mosquito sample, or "pool," is a collection of approximately 50 mosquitoes that are tested together for West Nile virus.
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