Why screwworm is trending

<p>For the first time in decades, a case of flesh-eating New World screwworm has been detected in the United States. CNN's Jacqueline Howard explains what threats a screwworm infestation would pose, and what authorities are doing to prevent its spread. Discover more videos, including live streams and exclusive storytelling, on our <a href="http://cnn.com/watch">Watch</a> page.</p>