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West Nile virus (WNV) is a mosquito-borne virus that can cause mild illness (West Nile fever) or severe symptoms (encephalitis or meningitis - an inflammation of the brain) in humans and other animals. People primarily get West Nile from the bite of a mosquito that is infected with WNV.
All Washtenaw residents diagnosed with Lyme disease are reported to Washtenaw County Public Health. To date, there is no evidence that transmission of Lyme disease has occurred in Washtenaw County. In West Michigan, however, infected tick populations are present along the lakeshore. County residents may be exposed in other parts of Michigan or in other states.