The U.S. has closed its southern border again to livestock imports, saying a flesh-eating parasite has moved further north in Mexico than previously reported.

The U.S. has shut its southern border to livestock imports again after a flesh-eating parasite was found further north in Mexico than previously reported, raising alarm among American agriculture officials.

The US has reclosed its border with Mexico to livestock imports, saying a flesh-eating parasite has spread further north than previously reported and a risk to the US beef industry is now a "grave con