This 2003 photo provided by the Centers for Disease Control and Prevention shows a mosquito acquiring a blood meal from a human host. Credit: James Gathany | Centers for Disease Control and Prevention via AP

CONCORD, New Hampshire — The New Hampshire Department of Health and Human Services said it’s found the Eastern equine encephalitis virus in a horse in Northwood.

The department said Wednesday this is the first finding of the mosquito-transmitted virus in a horse this year, though a mosquito batch from Pelham tested positive for the virus two weeks ago.

[New England health officials warn mosquitoes carrying disease that causes brain infections]

The risk level for the town of Northwood will be increased to high, and the surrounding towns of Barnstead, Barrington, Deerfield, Epsom, Nottingham, Pittsfield and Strafford will increase from low to moderate.

Since 2004, there have been 15 human infections with the virus identified in New Hampshire; the last human case in the state was in 2014, when there were three cases. There have been no infections identified yet this season in humans.