The first people to arrive in the Western Hemisphere were Indigenous Americans, who were descended from an ancestral group of ...

STORY: The U.S. has confirmed the first human case in the United States of travel-associated New World screwworm. It involved a patient who returned from travel to El Salvador, according to U.S.

A Maryland resident has been diagnosed with a rare parasitic infection known as New World screwworm (NWS), marking the first human case in the United States in years. The Centers for Disease Control ...

The first human case of the flesh-eating parasite "New World screwworm "has been detected in the United States, the Department of Health and Human Services said early Monday. The case, involving a ...

The U.S. has confirmed its first human case of the New World screwworm, a flesh-eating parasite whose northward creep from South America has put the country's cattle industry on high alert in recent ...

Not an accolade anyone wants, but for the Xerces blue butterfly, its extinction is considered the first of any American ...