The US Department of Agriculture has suspended the transport of live cattle, horses and bison through ports of entry along the border with Mexico for at least two weeks. It’s part of an effort to curb the spread of New World screwworm,

The Department of Agriculture has temporarily halted the import of live cattle, horses and bison from Mexico to stop the spread of New World screwworm, a parasite that can be deadly to animals and hurt people.

The screwworm larva can devastate any mammal or bird it burrows into, raising alarms as flies spread northward.