Five more mosquito samples have tested positive for the West Nile virus, Suffolk County health officials said.

The positive samples were collected on July 12 and 13, the county’s Department of Health Services said Monday. Two samples came from Northport and the others were in Huntington Station, Holtsville and Selden.

The first case of the virus in mosquitoes, reported July 8, also was collected in a sample in Northport, on June 30.

No humans have tested positive, the agency said, but a bird, collected in Yaphank, did have a positive result.

In Nassau County, one mosquito sample has tested positive, a health department spokeswoman said Tuesday.

Suffolk health Commissioner James Tomarken said that positive samples in mosquitoes and birds indicates the virus is in the area.

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“While there is no cause for alarm, we advise residents to cooperate with us in our efforts to reduce the exposure to the virus, which can be debilitating to humans,” he said in a statement.

Those who get the virus can experience fever, headache, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, vision loss, numbness and paralysis, the agency said.

To reduce the risk of mosquito bites and possible infection, the agency said residents can eliminate areas of standing water; minimize outdoor activities between dusk and dawn; wear shoes and socks, long pants and long-sleeved shirts when mosquitoes are active; use mosquito repellent and repair screens on windows and doors.

To report dead birds, which might indicate the presence of West Nile virus, call the Public Health Information Line at 631-787-2200 from 9 a.m. to 4:30 p.m. weekdays.

To report mosquito problems or stagnant pools of water, call the Department of Public Works, Vector Control Division, at 631-852-4270.

More information is also is available at the health service’s website, suffolkcountyny.gov/health.