From the Napa Valley Register
September 14, 2019
Napa County Mosquito Abatement District is cautioning county residents after an invasive mosquito species capable of spreading disease was found in several Northern California counties a little more than a week ago.
The non-native mosquito, Aedes aegypti, also known as the yellow fever mosquito, was first discovered in Southern California in 2013, according to Abatement District General Manager Wes Maffei. It has since steadily spread north through the state.
Maffei said the mosquito can spread disease, namely dengue fever, Chikungunya, Zika virus and yellow fever. Though there has never been a locally acquired case of those diseases in California, the presence of the yellow fever mosquito creates a risk of transmission from residents who were sickened abroad.