Suffolk County plans to spray additional areas on Fire Island to control the adult mosquito population, health officials said.

Ground spraying with the pesticide Anvil is planned, weather permitting, from 6 to 10 p.m. Wednesday in Ocean Bay Park, Seaview and Ocean Beach, officials said.

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Health officials previously announced ground spraying Tuesday, from 6 to 10 p.m. in Davis Park and Point O'Woods.

Besides being annoying, some mosquitoes' bites transmit West Nile virus to humans. Mosquitoes pick up the virus by feeding on infected birds.

Four human West Nile cases were reported in the county last year and no deaths, with 178 mosquito samples testing positive, a spokeswoman said.

The chances of experiencing health effects from spraying are "quite low," the health department said, but children and pregnant women should avoid exposure when possible by staying clear of the area during and at least 30 minutes after spraying. Among the "common-sense steps" the department suggests is closing doors, windows and air-conditioning vents during and 30 minutes after spraying.

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For more information, call Suffolk's spraying information hotline at 631-852-4939 or visit