 confirmed the nation’s first human case of the New World screwworm parasite. The patient, a Maryland resident, had recently returned from travel to El Salvador.){kind=link}
Case Linked to Travel
The U.S. Department of Health and Human Services (HHS) confirmed the nation’s first human case of the New World Screwworm. The patient, a Maryland resident, had recently returned from travel to El Salvador. State health officials said the individual has since recovered, and there is no evidence of further spread.
What Is the New World Screwworm?
The parasite is caused by a species of fly whose larvae feed on live tissue, burrowing into wounds with sharp hooks. Left untreated, infestations can cause severe damage and even death in animals and humans.
Global Outbreak Concerns
While eradicated in the U.S. decades ago, outbreaks have surged across Central America. Panama reported more than 6,500 livestock cases in 2023, compared to just 25 annually in previous years. The parasite has since spread to seven other countries in the region.
U.S. Preventive Measures
The U.S. Department of Agriculture (USDA) says the risk to the public remains low but warns the parasite could threaten ranching, food supply, and national security. Measures include building a sterile fly facility in Texas, deploying mounted patrol officers, and using detector dogs at ports of entry.
In May, the USDA temporarily banned imports of live cattle, horses, and bison from Mexico and later issued restricted reopenings. The FDA has also authorized emergency animal drugs to treat screwworm infestations.
Who Is at Risk?
According to the CDC, higher-risk groups include travelers to outbreak areas, people spending time around livestock, and those with open wounds who sleep outdoors.
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