A mosquito in Lindenhurst has tested positive for West Nile virus, Suffolk County officials said.
In addition to the mosquito, which was collected on July 2, officials have found the virus in American robins on July 3 in East Islip and June 16 in Selden.
"The confirmation of West Nile virus in mosquito samples or birds indicates the presence of West Nile virus in the area," Suffolk County Health Services Commissioner James Tomarken said in statement.
Tomarken said there is no cause for alarm but urged residents to eliminate stagnant water -- where mosquitoes breed -- in and around their homes.
The health department also advises residents to minimize outdoor activities and cover their skin in the evening and night when mosquitoes are most active, and to use mosquito repellent outdoors.
No humans in Suffolk have tested positive for the virus this year. The virus can be transmitted to humans through mosquito bites and was first detected in mosquitoes and birds in Suffolk in 1999.
In some cases, the virus causes serious neurological illnesses that can lead to permanent effects or death. Last year, 2,469 cases of human infection were reported in the United States, resulting in 119 deaths.