Uptick seen in rare mosquito-borne virus in some US states

NEW YORK (AP) — Heath officials say U.S. deaths and illnesses from a rare mosquito-borne virus are higher than usual this year.
Eastern equine encephalitis has been diagnosed in 21 people in six states and five people have died. The infection is only being seen in certain counties within a small number of states. The U.S. each year has seven illnesses and three deaths, on average.
It’s not clear why numbers are up this year, but for some reason cases seem to spike once every several