YORK, Neb. (AP) — The second confirmed human case of West Nile virus in Nebraska this year has been reported in Butler County.

Christine Lawrence, a spokeswoman for the Four Corners Health Department says a man over the age of 50 has the virus, which is transmitted by the bite of an infected mosquito.

The first case was reported last week in a Hamilton County man in his 70s.

Lawrence says the cases are earlier than usual. West Nile usually shows up in the late summer or early fall.

State health officials say West Nile activity is increasing across the state. Residents should use mosquito repellent and dress in long sleeves when outside.

Mosquitoes in Adams, Douglas, Hall, Madison, Scottsbluff, Sheridan and Richardson counties tested positive as have birds in Madison and Phelps counties