Probable locally acquired mosquito-transmitted malaria in Georgia, 1999.

In July 1999, the Centers for Disease Control and Prevention received notification of a case of malaria in a 32-year-old female native of Colquitt County, Georgia, who had no history of travel into an area where malaria transmission is endemic. An epidemiological investigation confirmed the absence of risk factors, such as blood transfusion, organ transplantation, malariotherapy, needle sharing, or past malaria infection. Active case finding revealed no other infected persons in Colquitt County. Light trapping and larvae-dipping failed to identify adult or larval anophelines; however, Colquitt County is known to be inhabited by Anopheles quadrimaculatus, a competent malaria vector. The patient's home was located near housing used by seasonal migrant workers from regions of southern Mexico and Central America where malaria is endemic, one of whom may have been the infection source. The occurrence of malaria in this patient with no risk factors, except for proximity to potentially gametocytemic hosts, suggests that this illness probably was acquired through the bite of an Anopheles species mosquito.