In San Diego County, there are 27 different species of mosquitoes, at least 9 of which are known to carry diseases that can be passed to humans. Native Culex mosquitoes can transmit West Nile virus and tend to bite during dusk and dawn. Invasive Aedes mosquitoes bite during the day and can transmit Zika, dengue, yellow fever, and chikungunya viruses. All mosquitoes lay their eggs in or near standing water. Finding and removing or treating standing water is the best way to control mosquito problems. 













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