In each case, the virus was identified as Culex pipiens/restuans. In Suffolk, the sample testing positive was collected June 23 in West Babylon; in Nassau, the positive sample was collected June 30 in Bethpage.
Each county health department said no humans have tested positive for the West Nile virus. Officials said preventive measures, including inspecting breeding sites and applying larvicide, will continue.
Officials also urged residents to take the following precautionary measures:
Remove or empty standing water from outdoor toys, flowerpots, garbage cans, pails and other objects that can hold water.
Clean clogged gutters in the spring and fall.
Keep swimming pools chlorinated and their covers free of stagnant water.
Change water in birdbaths every two or three days.
Install window and door screens, and keep them in good repair.
Consider wearing long sleeves, pants, socks and mosquito repellent when outdoors, especially in the late afternoon and evening.
Decorative ponds and water features that do not contain fish to prevent mosquito breeding should be circulated or chlorinated.
Turn over plastic wading pools and wheelbarrows when not in use.
Clean vegetation and debris from the edges of ponds, and keep shrubs and grass trimmed.
In Nassau County, for stagnant water, mosquito or drainage problems, call 516-572-1166, weekdays from 7:45 a.m. to 3:30 p.m. For information from the Nassau County Department of Health, call 516-572-1211. On the Web, visit www.nassaucountyny.gov/agencies/Health/westnile.html.
In Suffolk County, to report mosquito problems, call the Department of Public Works, 631-852-4270. For information on West Nile virus, visit the Department of Health Services' website, suffolkcountyny.gov/health.