TUSCALOOSA, Ala. (AP) -- Authorities say a half-dozen people in Alabama have been diagnosed with the West Nile virus this year.

Alabama public health officials say that it's the highest number of cases in the state in three years.

The virus, which is transmitted by mosquitoes, causes symptoms such as fever, body aches, joint paints, vomiting, diarrhea or rash in about one out of every five people who are infected.

Authorities say most people infected with the mosquito-borne virus won't get sick. Symptoms include headache, high fever, neck stiffness, disorientation, coma, tremors, convulsions, muscle weakness and paralysis.