Flesh-eating screwworm: What is it, symptoms, how it returned to US after 60 years

Flesh-eating screwworm: What is it, symptoms, how it returned to US after 60 years
Flesh-eating screwworm has been detected in the U.S. after six decades of eradication.

The parasite pest was found last week in a 3-week-old calf in Zavala County, Texas.

Scientifically known as...