Fortunately, less than 2% of all mosquito species are capable of carrying and transmitting West Nile Virus. The Southern House Mosquito in Texas is the mosquito primarily responsible for local infections. Eastern Equine Encephalitis is spread by the species Culiseta Melanura (common name: Black Swamp Mosquito) which frequent woody marshlands. Dog/cat Heartworm is transmitted through multiple species of mosquitoes, but can be sufficiently prevented with medication.