Arboviral (short for arthropod-borne) diseases are caused by arboviruses that are spread to people by a bite of an infected arthropod, including mosquitoes and ticks. In the United States, mosquitoes can spread West Nile virus (WNV), California serogroup viruses (California encephalitis, La Crosse encephalitis, and Jamestown Canyon), Eastern equine encephalitis virus (EEEV), Western equine encephalitis virus (WEEV), and St. Louis encephalitis virus (SLEV).
In Wisconsin, we usually see reports of La Crosse encephalitis, West Nile, and Powassan virus infections. These infections generally occur during the warm-weather months when mosquitoes and ticks are active. Symptoms of illness are usually mild and nonspecific, and can include headache, fever, fatigue, muscle aches, and swollen lymph nodes. Some people may experience severe neuroinvasive illness, including flaccid paralysis, encephalitis (swelling of the brain) and meningitis.
Mosquito transmitted diseases
Travel related diseases
Tick transmitted disease
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Additional Info Group
Educational Material Available from the Department of Health Services
- Form/Publication Number DPH-42166
- Form Name “Use Protection, Avoid Infection” Mosquito-borne Pocket Card
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