Virchow, being entitled to choose the weapons, chose two pork sausages, one infected with the roundworm " Trichinella "; the two would each choose and eat a sausage.
22.
The protozoan " Toxoplasma gondii " has been found in polar bears, and the nematode " Trichinella nativa " can cause a serious infection and decline in older polar bears.
23.
It has Virchow, having been the challenged and therefore entitled to choose the weapons, selecting two pork sausages, a normal sausage and another one, loaded with " Trichinella " larvae.
24.
Female " Trichinella " worms live for about six weeks, and in that time can produce up to 1, 500 larvae; when a spent female dies, she passes out of the host.
25.
Fresh pork may contain trichinosis, a parasitic disease caused by eating raw or undercooked pork or wild game infected with the larvae of a species of roundworm " Trichinella spiralis ", commonly called the trichina worm.
26.
The chances of a person becoming infected with " Trichinella spiralis " are relatively low in the United States, due to such rigorous control measures, while there are higher prevalence rates in regions such as Europe and Asia.
27.
The classical agent is " T . spiralis " ( found worldwide in many carnivorous and omnivorous animals, both domestic and sylvatic ), but there are also seven primarily sylvatic species of " Trichinella " now recognized:
28.
In " Trichinella spiralis, " the roundworm that causes trichinosis, a host has both reproductive adults in its digestive tract and immature juveniles in its muscles, and is therefore considered both an intermediate host and a definitive host.
29.
Thus according to the International Commission on Trichinellosis, meat should be heated at for at least 1 minute to kill " Trichinella " larvae; larvae die when the color of the meat at the core changes from pink to brown.
30.
APHIS developed the National Trichinae Certification Program; this is a voluntary " preharvest " program for U . S . swine producers " that will provide documentation of swine management practices " to reduce the incidence of " Trichinella " in swine.
