The re-emergence in June has prompted veterinarians to issue urgent advice for pet owners, particularly those residing near the U.S.-Mexico border.

The re-emergence in June has prompted veterinarians to issue urgent advice for pet owners, particularly those residing near the U.S.-Mexico border.

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Screwworm, a flesh-eating parasite that can be fatal if untreated, has re-entered the US Southwest for the first time since the 1970s.