In veterinary offices along the southeastern coast of Uruguay, the cases did not arrive all at once. One cat came in with raw sores around the nose and paws. Another had crusted wounds across the face ...

On a sweltering morning last July, Vernon Spear, a burly eighty-five-year-old with thinning gray hair, went to check a chicken-wire crab trap that was hanging from a dock in Cambridge, Maryland. Spear ...