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Health officials say the insects were collected from four locations in Staten Island, Brooklyn and Queens.

So far, no human cases have been detected this season.

Officials say they are increasing monitoring and mosquito larvae control efforts in the affected areas.

They're also reminding New Yorkers to protect themselves by:

• Wearing an approved insect repellent when outdoors

• Cover their arms and legs if they’re outside at dusk or dawn.

• Making sure windows have screens

• Eliminating any standing water from their property

• Cleaning and chlorinating swimming pools, outdoor saunas and hot tubs.

West Nile virus can cause encephalitis or a more moderate flu-like illness.

For more information, call the city hotline at 311.