The flesh-eating parasite, the American screwworm, continues to spread in the United States. Three new cases have been confirmed, and there is great concern that the worm will spread into the country's livestock industry.
So far, five cases have been confirmed: three calves and a goat in Texas and a dog in New Mexico, according to the US Department of Agriculture.
The screwworm is a fly larva that feeds on living tissue. It attacks only live animals and does not affect meat products.
