Tests for West Nile Virus in Contra Costa County have shown 2012 to be the worst season for the virus since 2008. Here are the testing -totals over the past five seasons.

2012

Dead Birds: 56

Mosquito Samples: 19

Sentinel Chicken Flocks: 2

Tree squirrels: 0

Horses: 0

2011

Dead Birds: 43

Mosquito Samples: 7

Sentinel Chicken Flocks: 0

Tree squirrels: 0

Horses: 0

2010

Dead Birds: 8

Mosquito Samples: 4

Sentinel Chicken Flocks: 3

Tree squirrels: 0

Horses: 0

2009

Dead Birds: 45

Mosquito Samples: 17

Sentinel Chicken Flocks: 2

Tree squirrels: 2

Horses: 0

2008

Dead Birds: 88

Mosquito Samples: 30

Sentinel Chicken Flocks: 2

Tree squirrels: 9

Horses: 3



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