Last week Grand Forks officials found the virus in a dead crow.

FARGO, N.D. (AP) — Cass County officials says the season's first sign of disease carrying mosquitoes turned up in one of its traps along the Red River in north Fargo.

County Vector Control Director Ben Prather says a small sample tested positive for West Nile. While that's not uncommon, Prather says it's earlier than usual.

KVRR-TV reports there were 21 confirmed cases of West Nile in Cass County last year and one death was attributed to the disease. That's the highest number of confirmed cases locally since 2007 when there were a record 49 cases.

Last week Grand Forks officials found the virus in a dead crow.