By Cassandra Garrison, Tom Polansek and Leah Douglas BUENOS AIRES/CHICAGO/WASHINGTON (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 case of the flesh-eating screwworm parasite has been identified in a person in Maryland who had traveled to the United States from Guatemala, according to four sources familiar with the situation. The person,

"The risk to public health in the United States from this introduction is very low," said HHS spokesperson Andrew Nixon.