2021 Weekly Updates

Activity within the District is updated every Friday. For information about WNV in the entire state of California, please visit westnile.ca.gov.

Mosquito Samples

West Nile Virus: 210        St. Louis Encephalitis Virus: 1        Western Equine Encephalitis Virus: 0

There were 39 new WNV and 1 SLEV positive mosquito samples detected the week of September 5th through September 11th. Of these, 31 mosquito samples were collected from Visalia, 8 from Peral, and 1 from Exeter. This is the first SLEV detection in the District for the year. Test results are pending for 51 mosquito samples that were also collected this week. A total of 211 mosquito samples have tested positive from 6 cities and 2 rural areas in the District, out of the 2,017 mosquito samples tested in 2021.

A sample may contain up to 50 individual mosquitoes.

Dead Birds

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. 

Human Cases

West Nile Virus: 3         St. Louis Encephalitis Virus: 0         Western Equine Encephalitis Virus: 0

There was 1 new human case of WNV reported to Delta MVCD this week. The probable human WNV case reported previously was also confirmed this week. There has been a total of 3 WNV positive human case in the District in 2021.

The Tulare County Public Health Department reports human cases to the District.