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Current West Nile Virus Activity Map

May contain: animal, insect, invertebrate, and mosquito

The District’s surveillance program collects samples of adult mosquitoes and sends them to a lab to be tested for West Nile virus.  If a sample test positive, the date and location the sample was collected is recorded on a mapping system maintained by the Center for Vectorborne Disease at UC Davis.  The most recent map may be viewed by clicking on the below link: