[Source: Reuters]

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 in 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.

The differing accounts from the U.S. government and industry sources on the human case are likely to further rattle an industry of cattle ranchers, beef producers, and livestock traders already on high alert for potential U.S. infestations as screwworm has moved northward from Central America and southern Mexico.

The government’s confirmation of a screwworm case comes just over a week after U.S. Department of Agriculture Secretary Brooke Rollins traveled to Texas to announce plans to build a sterile fly facility there as part of efforts to combat the pest.

The USDA has estimated a screwworm outbreak could cost the economy in Texas, the biggest U.S. cattle-producing state, about $1.8 billion in livestock deaths, labor costs, and medication expenses.

An executive of the industry group Beef Alliance sent emails last week to about two dozen people in the livestock and beef sectors, informing them that the CDC had confirmed a human case of screwworm in Maryland in a person who had traveled to the U.S. from Guatemala, according to a source, who asked not to be identified, and who shared the contents of the emails with Reuters.

Beth Thompson, South Dakota’s state veterinarian, told Reuters on Sunday that she was notified of a human case in Maryland within the last week by a person with direct knowledge of it.

CDC deferred questions to Maryland on a call with state animal health officials, Thompson said.

“We found out via other routes and then had to go to CDC to tell us what was going on,” she said. “They weren’t forthcoming at all. They turned it back over to the state to confirm anything that had happened or what had been found in this traveler.”

Another source said that state veterinarians had learned about a human case in Maryland during a call last week with the CDC. A Maryland state government official also confirmed a case.

A spokesperson for the Maryland Department of Health did not immediately respond to requests for comment.

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