South District Health Director Dr. Lynne Feldman said recent flooding has caused the increase. The number of mosquitoes caught in traps in Lowndes County has increased from an average of nine per trap a month ago to an average of 786 per trap now.
Mosquitoes can spread West Nile virus and other diseases. No mosquito-borne disease has been detected in the area so far.
The declaration of emergency is meant to give the county priority status and resources to help enhance mosquito control.
Residents are encouraged to take precautions to prevent mosquito bites.