Trichinosis a parasite that could be found in pork or bear meat. It can be killed by freezing for 20 days at -5F, 10 days at -10F or 6 days at -20F. or you can heat the meat up to 138F to kill it. Since jerky is not usually heated but just dried. Only use certified Pork(pre-frozen to kill any trich) when making jerky or dried sausage. Better yet don't add any pork or bear meat to your jerky. Use the bear and pork for fresh sausage that will be cooked than you have no worries.