Eastern equine encephalitis has been found in mosquitoes trapped in Sandown, the first in the state since an animal tested positive in 2010.
The town will spray at Sandown North School, Sandown Central School, the Roy Miller Recreation Center and Garvey Recreation Center on Sunday from 5:30 to 9:30 p.m.
Spraying also is planned in nearby Kingston tomorrow and in Newton Friday.
In Sandown, Dragon Mosquito Control will use backpack sprayers and a truck-mounted sprayer. No townwide road spraying is scheduled, according to the town website.
Numerous mosquito batches have tested positive for West Nile virus in New Hampshire this year, prompting the Department of Health and Human Services to request and receive a declaration of a public health threat from Gov. John Lynch.
That happened Friday. Dr. Jose Montero, the state's public health director, said the move allows the state Department of Agriculture to expedite the permitting process required for municipalities who decide to spray.
Atkinson and Derry both sprayed Monday night; Londonderry sprayed last week.
As of Friday, the state reported 36 mosquito batches had tested positive for West Nile and there has been one human case. The Manchester resident has since recovered. Until today, there had been no reports of EEE.
The number of West Nile positive findings is a significant spike over past years. Last year, the state had just nine positive batches, and one or none in the four years before that.
That mirrors what's going on elsewhere in the country, especially in Texas.
As of Tuesday, 48 states have reported West Nile infections in people, birds or mosquitoes — 1,590 human cases, including 66 deaths, according to the Centers for Disease Control. Nearly half of all cases have been reported in Texas.
Those numbers, which experts expect to climb, represent the highest number of West Nile cases ever reported to the CDC through the last week of August. The disease was first detected in this country in 1999.
It will take two hard frosts to eliminate the risk, Montero said last week. In the meantime, many towns are spraying and residents are urged to use mosquito repellant whenever they go out. Repellant with DEET is strongly recommended.