U.S. Reports First Travel-Related Human Screwworm Case Linked to Central American Outbreak
First Human Case of Travel-Related New World Screwworm Reported in the US
The Department of Health and Human Services has confirmed the first human case of the flesh-eating parasite, New World screwworm, linked to travel abroad. The patient, who had traveled to El Salvador, was diagnosed after returning to Maryland. The case was verified by the CDC on August 4 and involves a person who visited an outbreak-affected country.
While earlier reports suggested a similar case in Maryland involving travel from Guatemala, the CDC has not publicly addressed the discrepancy. Officials assured that the public health risk remains very low, and no animal infections have been reported in the US this year.
The parasite, a parasitic fly, lays eggs in wounds of warm-blooded animals. The larvae then burrow into flesh, which can be fatal if untreated. Treatment involves removing the larvae and disinfecting wounds. Early detection typically ensures survival.
Industry insiders circulated emails indicating that a human case had been confirmed in Maryland, though details remain confidential due to privacy laws. The person received treatment, and precautionary measures have been taken locally. The case has heightened concerns among cattle ranchers and beef producers, especially as screwworms have been moving northward from Central America.
US officials recently announced plans to establish a sterile fly production facility in Texas to combat the pest, following a visit by USDA Secretary Brooke Rollins. The outbreak could potentially cost Texas approximately $1.8 billion in livestock losses and related expenses.
Understanding Screwworms
Screwworms are a serious threat to livestock and wildlife, with infestations potentially fatal if untreated. They rarely infect humans but can be deadly for both. Prevention involves early treatment, which can be complex and costly. The US eradicated screwworms in the 1960s through extensive sterile fly releases, but the pests are now moving north again.
In response to rising threats, the US is constructing facilities to produce sterile flies for release, aiming to control the spread. Mexico has also begun building a sterile fly plant to prevent further invasion.