Pennsylvania Health officials are warning of the spread of a rare mosquito-transmitted viral infection in the commonwealth. Eastern Equine Encephalitis, or E-E-E has been found in Carbon, Erie, and Monroe counties this year. The virus is carried by birds and passed to humans and horses by mosquito. It’s said to have a high mortality rate for the infected. Through mid-September of this year, the C-D-C says it has had 18 reported cases nationwide.