Human cases of West Nile virus reported in Kern (copy)

West Nile virus is transmitted by mosquitoes and often spreads during the summer and early fall, according to Kern County Public Health Services.

A fourth West Nile Virus case was reported in Kern County this week by the California Department of Public Health, which updates cases weekly on its website. 

The county's first case of 2020 was reported on Oct. 6.

Last year there were 32 cases of West Nile Virus in Kern County.

Peak infection months are September and August during warmer weather. Risk of exposure decreases as cooler temperatures kill most mosquitoes or send them into hibernation.