Stay up to date on mosquito-borne virus activity within the District. Delta Mosquito and Vector Control District mosquitoes and dead birds for West Nile Virus (WNV), St. Louis Encephalitis Virus (SLEV), and Western Equine Encephalitis Virus (WEEV).
2021 Mosquito-borne Virus Activity in the District
LAST UPDATED: October 18, 2021
2021 Weekly Updates
Arbovirus testing in is done for the year. The District will continue to accept dead birds for testing. Activity within the District is updated every Friday. For information about WNV in the entire state of California, please visit westnile.ca.gov.
West Nile Virus: 278 St. Louis Encephalitis Virus: 4 Western Equine Encephalitis Virus: 0
There were no new WNV positive mosquito samples detected the week of October 11th through October 15th. A total of 282 mosquito samples have tested positive from 7 cities and 2 rural areas in the District, out of the 3,034 mosquito samples tested in 2021.
A sample may contain up to 50 individual mosquitoes.
West Nile Virus: 5 St. Louis Encephalitis Virus: 0 Western Equine Encephalitis Virus: 0
No new dead birds have tested positive for WNV this week. A total of 5 dead birds have tested positive in the District out of 12 dead birds tested in 2021.
Report dead birds to the WNV call center at 1-877-968-2473. Dead birds may be testable for WNV, SLEV, and WEEV.
West Nile Virus: 4 St. Louis Encephalitis Virus: 1* Western Equine Encephalitis Virus: 0
There were no new human cases of WNV reported to Delta MVCD this week. There has been a total of 4 WNV positive human cases and 1 human case with a WNV and SLEV co-infection in the District in 2021.
The Tulare County Public Health Department reports human cases to the District.
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Visalia, CA. 93291
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