Mosquitoes and disease in Wisconsin

Mosquitoes can transmit several viruses that can cause human disease.  In Wisconsin, these include West Nile virus, La Crosse virus, and Jamestown Canyon virus.  We also see cases of disease that are imported (people who travel outside the state and pick up an infection somewhere else).  In this section, I will provide information about disease and vectors. 

Recently, the Zika virus has been in the news because of epidemics in Latin America that are associated with microcephaly.  Zika virus is known to be transmitted by 2 species of mosquito that have not been found in Wisconsin.  These are Aedes aegypti (the yellow fever mosquito) and Aedes albopictus (the Asian tiger mosquito).  We don’t know yet whether other mosquitoes can transmit the virus but the risk appears to be low. Mosquito trapping in southern Wisconsin during 2016 failed to find the Asian tiger mosquito.  Trapping in 2017 will focus on industrial corridors.  Three eggs have been collected of the Asian tiger mosquito as of July 19.