Health officials say Pinal County has its first human case of West Nile virus this year.
It's also believed to be the first West Nile case in Arizona so far this year.
Pinal Public Health Services District officials say a Casa Grande man is recovering. No other information about the victim was released Friday.
Health officials say they usually don't start seeing West Nile cases until early July.
The virus is transmitted to humans by the bite of an infected mosquito.
It can cause symptoms ranging from mild flu-like symptoms to severe neurological symptoms.
Horses also are susceptible to the virus.
Last year, there were two confirmed West Nile cases in Pinal County.
Around the state, authorities say there were 62 confirmed cases last year with six fatalities.