Skip to main content



Trichinosis is caused by an intestinal roundworm, Trichinella spiralis, which typically infects wild mammals, such as bears, cougars, and wild boar, or domestic pigs. Human infection results from eating undercooked pork or wild game harboring the encapsulated cysts of T. spiralis. Encysted larvae survive some preparation methods for wild meat jerky, and some strains resist freezing. The larvae may infect persons if the meat is consumed without further cooking.

Resources for the general public

Resources for health care professionals

Trichinosis in King County

Purpose of surveillance:

  • To identify common source exposures
  • To identify and eliminate infected food products in order to prevent further consumption