DALLAS (AP) — Health authorities in North Texas will begin spraying for West Nile virus after detecting a “significant” increase in the type of mosquito that primarily carries the virus.

The city of Dallas will spray from trucks beginning Monday evening and continuing through early Wednesday morning. Neighborhoods being targeted are ones where tests have shown a rise in the species of female mosquito most likely to transmit the virus.

Crystal Woods, division manager for mosquito control for the city, says there are no confirmed cases of West Nile in either the city or Dallas County. But she says officials are spraying to stem any outbreak.

The program is meant to kill airborne mosquitoes. It’s the first time this year the city is spraying.

Residents are encouraged to stay indoors when the spraying is done.

The Town of Flower Mound has also issued notice that spraying will begin there on Wednesday and continue through Friday, between 10 p.m. and 6 a.m. Two positive mosquito samples have collected from traps in the 6600 block of Orchard Drive. Spraying will occur within a one-half square mile radius of this location.

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