West Nile Virus ActivityConfirmed Casesin California 2009 YTD vs 2008 YTD As of 7/16/09 Source:http://www.westnile.ca.gov | ||
| (2009 YTD-Year to date corresponds to the same time last year) |
2008 YTD | 2009 YTD |
| # of Counties | 49 | 31 |
| Human Cases | 445 | 0 |
| Horses | 32 | 0 |
| Dead Birds | 2569 | 169 |
| Mosquito Samples | 2003 | 120 |
| Sentinal Chickens | 585 | 5 |
| Squirrels | 32 | 1 |
What is West Nile Virus?
West Nile virus (WNV) is a potentially serious illness. Experts believe WNV is established as a seasonal epidemic in North America that flares up in the summer and continues into the fall. WNV season runs June 1-Nov. 1.
How WNV IS Spread to Humans?
WNV virus is transmitted to humans and animals through a mosquito bite. Mosquitos become infected when they feed on infected birds. Human-to-human transmission of WNV does not occur. However, human WNV infections have been associated with blood transfusions and organ transplants.
Control Activities in Alameda County
West Nile Virus was detected in 46 of California’s 58 counties (as of 11/08). During WNV season, Alameda County’s Mosquito Abatement program works to limit risks to residents by monitoring ponds and other possible mosquito breeding sites; trapping to detect high numbers of mosquitoes; treating sewer catch-basins to prevent breeding; collecting birds for testing; and educating residents and owners about removing standing water from private property to limit mosquito breeding and mosquito bites.