The Maryland Department of Health, in coordination with the U.S. Centers for Disease Control and Prevention (CDC), U.S. Department of Agriculture (USDA), Maryland Department of Agriculture, and local and state partners, recently investigated a CDC-confirmed case of travel-associated New World screwworm (NWS) myiasis in a resident of Maryland who had returned from a
country currently experiencing a NWS outbreak.
The Maryland resident has recovered, and the investigation confirmed there is no indication of transmission to any other individuals or animals. Currently, the risk to public and animal health in Maryland from this introduction is very low.
NWS infestation occurs when NWS fly larvae infest the tissue or flesh of warm-blooded animals. NWS does not regularly occur or spread in the U.S. In places where the flies are present, people can also become infested.
The recent detection serves as a timely reminder for health care providers, livestock owners, travelers and others to maintain vigilance as prevention is paramount.
Travelers to
NWS-endemic and the NWS outbreak areas are advised to keep any open wounds covered, wear loose-fitting, long-sleeved shirts and pants and socks, and use U.S. Environmental Protection Agency (EPA)-registered
insect repellents. Travelers to NWS-endemic areas should also avoid sleeping outdoors and protect sleeping quarters with screens or bed nets to help prevent any potential infestations.
Health care providers in Maryland should report suspected cases immediately to the Maryland Department of Health at 410-767-6700 or their
local health department. For a clinical overview of NWS myiasis, visit
HHS CDC.
Livestock owners in Maryland should monitor their animals for any symptoms and immediately report any suspected cases to the Maryland Department of Agriculture at 410-841-5810. A comprehensive list of symptoms and effective prevention strategies can be found at
USDA APHIS.
Related Links: HHS CDCUSDA APHISMaryland Department of AgricultureLast Updated: 8/26/205
