The Department of Health and Human Services has confirmed the first human case of the flesh-eating New World screwworm parasite in the US.

A rare case of travel-related New World screwworm was identified in Maryland in a patient who traveled from El Salvador, a spokesman from the US Department of Health and Human Services said.

The first human case of the flesh-eating parasite "New World screwworm" has been detected in the United States in a person who had recently traveled to El Salvador. NBC News medical contributor Dr. Kavita Patel talks about the risks to humans and the implication of the parasite's presence can mean for cattle and agriculture in the U.