West Nile Virus — United States
The _Culex pipiens_ mosquito is the insect primarily responsible for the spread of West Nile virus in the Bay Area [California]. The number of birds and mosquitoes testing positive for the West Nile virus has increased by 50 percent in the past week, the county Mosquito & Vector Control District reported on [Fri 17 Aug 2018].
In the past week, there have been 4 groups of mosquitoes, 4 dead birds, and one group of sentinel chickens that have tested positive for the West Nile virus. The
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