Female mosquitoes pick up the virus by feeding on infected birds. Birds and mosquitoes are part of the transmission cycle.įor both WNV and EEE, the virus is amplified in infected birds. While there were only 10 reported cases of WNV in Michigan birds in 2020, there were 32 confirmed human cases, according to data from Michigan Emerging Disease Issues website.Ģ. In 2020, four human cases of EEE, including two deaths, and 41 animal cases were confirmed across 19 Michigan counties. In 2019, Michigan experienced one of the worst outbreaks of EEE ever documented in the state, with 10 human cases - including six deaths - and 50 cases in animals from 20 counties. Therefore, the number of cases and affected species can vary widely year over year. Rainfall and temperature patterns play a role in how successful these viruses are in the infection of birds and mosquitoes, and ultimately, spillover cases that include some animals and humans. Mosquitoes and associated disease risks are seasonal.īecause mosquitoes spread both WNV and EEE, the diseases are seasonal and most often diagnosed in late summer through early fall. What do you need to know to protect yourself and your animals? The MSU Veterinary Diagnostic Laboratory shares three important pieces to stay safe.ġ. While EEE cases primarily occur in the Eastern U.S., WNV is found throughout the United States. Many people know that mosquitoes transmit heartworm infections, malaria and Zika virus but in Michigan, two mosquito-borne viral diseases - West Nile virus, or WNV, and Eastern equine encephalitis, EEE, - pose a fatal threat to humans and animals, especially horses. Michigan State University’s Veterinary Diagnostic Laboratory tests for these harmful diseases to help veterinarians and public health officials identify and track cases. Mosquitoes are more than just a nuisance in the great outdoors - they can also spread harmful diseases to humans and animals alike.
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