The number of animals infested with a parasitic fly whose larvae feast on living flesh has risen to five, according to the US Department of Agriculture.

Two more cases of the New World screwworm have been confirmed in Texas, demonstrating the difficulty of stopping the spread of a pest that potentially could devastate the nation’s…

Two more cases of the New World screwworm have been confirmed in Texas, demonstrating the difficulty of stopping the spread of a pest that potentially could devastate the nation’s…