OverviewTrichinosis (trik-ih-NO-sis), sometimes called trichinellosis (trik-ih-nuh-LOW-sis), is a type of roundworm infection. These roundworm parasites (trichinella) use a host body to live and reproduce. These parasites infect animals such as bears, cougars, walruses, foxes, wild boars and domestic pigs. You get the infection by eating the immature form of the roundworm (larvae) in raw or undercooked meat.When humans eat raw or undercooked meat containing trichinella larvae, the larvae grow in