SUFFOLK COUNTY, New York (WABC) -- A mosquito has tested positive for the West Nile virus in Suffolk County.
The county's health department says the virus has been present in Suffolk County since 1999.
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ARCHIVE:West Nile virus kills three in Nassau County in 2008
Most people who contract the virus will only experience mild or no symptoms.
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People over the age of 50 or who have compromised immune systems are most vulnerable.
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