New World Screwworm Detected in U.S. Traveler

August 24, 2025

A rare case of New World screwworm has been confirmed in a person traveling from abroad into Maryland, according to federal health officials.

The Centers for Disease Control and Prevention (CDC) quickly identified and treated the case, following established protocols. The individual was diagnosed upon arrival, and the incident was managed without complications.

Colin Woodall, CEO of the National Cattlemen's Beef Association (NCBA), emphasized that there is no elevated risk to the livestock industry at this time. "The case was quickly identified and handled by the CDC in accordance with their protocols," Woodall said.

"We appreciate the diligence of human health authorities. This case was quickly addressed thanks to existing protocols, and we are thankful for the ongoing coordination between the CDC, state departments of health, state animal health officials, and USDA."

The New World screwworm, a parasite capable of causing severe and often fatal infestations in animals, was eradicated from the U.S. in 1966 after an extensive campaign. It remains present in parts of South America and the Caribbean, making constant vigilance critical.

Animal health officials stress that the swift response in this case highlights the effectiveness of surveillance and coordination efforts between human and animal health agencies in protecting both public health and America's livestock.

Source: Western Ag Network & NCBA