TABLE 1.

Main epidemiological features of Trichinella species and genotypes^a

Species or genotype	Geographical distribution	Host range	Main source of infection of humans	Resistance of larvae in frozen muscles
Encapsulated
T. spiralis	Cosmopolitan	Domestic and sylvatic mammals	Domestic and sylvatic swine horses	Yes in horse muscles
T. nativa	Arctic and subarctic areas of America, Asia, Europe	Sylvatic carnivores	Bears, walruses	Yes in carnivore muscles
Trichinella genotype T6	Canada, Alaska, Rocky Mountains, and Appalachian Mountains in the United States	Sylvatic carnivores	Carnivores	Yes in carnivore muscles
T. britovi	Temperate areas of Europe and Asia, Northern and Western Africa	Sylvatic mammals and seldomly domestic pigs	Wild boars, domestic pigs horses, foxes, jackals	Yes in carnivore and horse muscles
Trichinella T8	South Africa and Namibia	Sylvatic carnivores	None documented	No
T. murrelli	United States and Southern Canada	Sylvatic carnivores	Bears, horses	No
Trichinella genotype T9	Japan	Sylvatic carnivores	None documented	No
T. nelsoni	Eastern-Southern Africa	Sylvatic mammals	Warthogs, bush pigs	No
Trichinella genotype T12	Argentina	Cougars	None documented	Unknown
Nonencapsulated
T. pseudospiralis	Cosmopolitan	Sylvatic mammals and birds, domestic pigs	Domestic and wild pigs	No
T. papuae	Papua New Guinea, Thailand	Wild pigs, saltwater crocodiles	Wild pigs	No
T. zimbabwensis	Zimbabwe, Mozambique, Ethiopia, South Africa	Nile crocodiles, monitor lizards	None documented	No

^aBased on data from reference 125.