WHO has confirmed 68 cases of Mexico virus worldwide . Mexico says illness declining there ; WHO warns it could return . U.S. has largest number of confirmed cases , followed by U.S. , the Centers for Disease Control and Prevention says . Mexican officials claim pigs at farm have been affected by virus .
WHO has confirmed 985 cases of H1N1 virus worldwide . Mexico says illness declining there ; WHO warns it could return . Mexico has largest number of confirmed cases , followed by U.S. , WHO says . Canadian officials claim pigs at farm have been affected by virus .