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Why the Delay in Reporting Case of Screwworm in Human?

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An adult New World screwworm (NWS) fly, which is about the size of a common housefly (or slightly larger). The name screwworm refers to the maggots' (larvae) feeding behavior as they burrow into the wound, feeding as they go like a screw being driven into wood. The NWS maggots cause extensive damage by tearing at the hosts’ tissue with sharp mouth hooks. The wound can become larger and deepen as more maggots hatch and feed on living tissue. As a result, NWS can cause serious, often deadly damage to the animal. Photo courtesy of USDA Animal and Plant Health Inspection Service (APHIS).

The Maryland Department of Health said the patient with the first human infection of a travel-associated New World screwworm in the U.S. has recovered from the flesh-eating parasite. There was also no sign of transmission to other people or animals.

The Health and Human Services Department said the disease was confirmed on August 4 in a person who traveled to El Salvador. The CDC then reported it on August 24 after a three-week delay.

R-CALF USA CEO Bill Bullard indicated that neither the CDC nor the USDA had disclosed the NWS detection to the public. Instead, one or both agencies had selectively notified only certain industry participants of the detection, thereby giving them insider information regarding an issue with potentially severe ramifications.

“Independent U.S. livestock producers rely exclusively on the USDA to protect the health and safety of their livestock herds against the introduction of foreign pests,” Bullard said.