GROSS: U.S. Confirms Nation's First Travel-Associated Human Screwworm Case

The U.S. Department of Health and Human Services on Sunday reported the first human case in the United States of travel-associated New World screwworm, a flesh-eating parasite, from an outbreak-affected country.

The case, investigated by the Maryland Department of Health and the U.S. Centers for Disease Control and Prevention, was confirmed by the CDC as New World screwworm on August 4, and involved a patient who returned from travel to El Salvador, HHS spokesman Andrew G. Nixon said in an email to Reuters.

Earlier, Reuters reported that beef industry sources said last week that the CDC had confirmed a case of New World screwworm in a person in Maryland who had traveled to the United States from Guatemala.

Nixon did not address the discrepancy on the source of the human case.

"The risk to public health in the United States from this introduction is very low," he said.

The U.S. government has not confirmed any cases in animals this year.