[A seasonal observation on the infection of a pig herd by Yersinia enterocolitica].
D000818:Animals; D012621:Seasons; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology*; D015009:Yersinia Infections / Q000453:epidemiology / Q000662:veterinary*; D015008:Yersinia enterocolitica / Q000302:isolation & purification