Anklam, Germany - Trichina worms, which infect pigs and cause a nasty rheumatic illness in humans, have returned to Germany, animal-health officials north of Berlin said Friday.

Trichinosis infects people who have undercooked pork containing the nematodes.

The worms were found at a slaughterhouse in a pig from a private home, veterinarian Holger Vogel said in Anklam.

Many area householders still keep pig-sties and raise pigs at home.