Zika is transmitted to humans primarily through the bite of an infected Aedes aegypti or Aedes albopictus mosquito. While both of these invasive mosquitoes have been found in several areas throughout California, they have not been detected in Marin and Sonoma counties.
Dengue is a mosquito-borne disease caused by any one of four closely related dengue viruses (DENV-1, DENV-2, DENV-3, and DENV-4).
Chikungunya (pronounced chik-en-gun-ye) is an infectious disease with symptoms that typically include fever and severe joint pain. It is caused by the chikungunya virus, which is transmitted to people by mosquitoes.