ISLIP, N.Y. (CBSNewYork) — West Nile virus has shown up again in Suffolk County as an effort to control the mosquito population gets underway.

The virus was detected in mosquitoes in Gardiner County Park in Islip, health officials said.

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Last month, a dead crow found in Northport also tested positive for the virus.

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On Tuesday night, crews will be spraying for mosquitoes on Fire Island after 6 p.m. in the communities of Davis Park, Ocean Bay Park and Point O’ Woods.

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So far, no human cases of West Nile have been reported this year.