Mosquitoes can act as reservoirs of diseases such as West Nile virus, malaria, yellow fever and dengue fever. The mosquito obtains a virus by biting an infected person or animal. Then, when biting you, the mosquito can transfer that virus or parasite to you through its saliva. West Nile and encephalitis viruses are found in the United States. Dengue fever, although it is rare, has been reported in the southeastern United States. Other diseases, such as malaria and yellow fever, are far more common in tropical areas of the world.

Oct. 24, 2012