First Human Case of ‘Horrific’ Flesh-Eating Parasite Detected in the U.S.
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The first known case of the “horrific” flesh-eating New World screwworm impacting a human has been identified in the United States. The United States Department of Health and Human Services (HHS) has confirmed that a person in Maryland has been affected by this painful parasite. The New World screwworm, which has been a threat to the U.S. cattle industry since the 1960s, typically infests livestock like cattle but can also affect humans.
The case involves an individual who had recently travelled to El Salvador, and is currently under investigation by the Maryland Department of Health and the U.S. Centers for Disease Control and Prevention (CDC). According to Department spokesman Andrew G. Nixon, the CDC confirmed the case as New World screwworm on August 4. Nixon stated that the risk to public health in the U.S. from this case is deemed very low.

The New World screwworm, a type of fly, has been gradually moving north from South America in recent years. Female flies lay their eggs on warm-blooded animals to reproduce, with the larvae causing extensive damage as they bore into the flesh of their host. Colin Woodall, CEO of the National Cattlemen’s Beef Association, described the parasite as “horrific” due to its destructive nature.
The CDC has highlighted that the infestation can be excruciatingly painful, with the presence of maggots around the infection site. The flies typically lay their eggs near wounds but can also affect areas such as the nose, eyes, and mouth. Medical intervention, sometimes involving surgery, is crucial to remove the larvae and treat the infection. While the infection is treatable, it can pose a serious risk if left untreated.
The U.S. Department of Agriculture has recently announced plans to address the threat posed by New World screwworms. The strategy involves investing in the creation of sterile male screwworms, which can be released into the environment to reduce the population. This approach aims to mitigate the impact of the fly, with female screwworms mating only once in their lifetime, making population control feasible.
In light of the recent case and the potential risks posed by the New World screwworm, it is essential to remain vigilant and take necessary precautions. The collaborative efforts between health authorities and agricultural organizations are instrumental in managing and containing such threats to public health and the livestock industry. By staying informed and proactive, it is possible to mitigate the impact of parasitic infestations and protect both humans and animals from harm.
