There are more than 40 different mosquito species in Washington state, many of which are known to transmit diseases.


Small, midge-like insects that feed on blood, many species of mosquito are capable of spreading diseases as they feed on different hosts. In Washington, mosquitoes may carry West Nile virus. Outside of Washington, mosquitoes are also carriers of Zika virus. The only species known to spread Zika to people are Aedes aegypti and Aedes albopictus. Neither species is found in Washington. Learn more about Zika and West Nile virus in the Health Topics section.

Bring It, Summer Pests!

Confront disease-carrying mosquitoes, ticks and mice during spring and summer months. Simple landscaping tricks and tips to protect home’s exterior.

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Animals & Insects Program

Preventing the spread of disease from animals to humans is a public health responsibility.

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