Invasive Aedes mosquitoes are not native to San
Mateo County, California, or even North America. They do not
belong in our ecosystems, and they can make people very
uncomfortable because they bite during the day and even bite
indoors. More importantly, they are a risk to human health
because they can carry diseases that make people very sick, like
Zika, chikungunya, dengue, and yellow fever.
Species of invasive Aedes mosquitoes are found in
some areas of Arizona and California. One species, Aedes
aegypti, has been found in San Mateo County before.
This interactive map by the California Department of
Public Health shows where they are currently found in our state.
The District has been working hard to get rid of invasive
Aedes mosquitoes in our county, and has been very
successful so far. The most recent time any invasive Aedes
aegypti mosquitoes were found in San Mateo County was in
May of 2015.
The District continues to conduct intensive surveillance
throughout the county, but you can help out by reporting
suspected invasive Aedes mosquito sightings.
The sooner we know that these invasive mosquitoes have arrived in
our county, the better chance we have of stopping them.
Join California in the Fight Against Zika - Don’t Bring Zika
Top 5 Things You Should Know About Zika
Zika virus is transmitted through the bite of an infected
mosquito and through unprotected sex with someone who is
infected. it can also spread from an infected pregnant
woman to her developing baby during pregnancy or around the time
You are at risk if you or your sexual partner travel to
areas with Zika, including Mexico.
A pregnant woman’s developing baby is at greatest risk of
being harmed by the Zika vi