Trich is nothing to be cavalier about, that's for sure, and freezing has been proven to be significantly less than 100% effective in killing the roundworm parasite, especially in animals taken in Northern climes. Bears, seals, and walrus, are the biggest source.
Just to really make the point, here's a copy and paste from the Mayo Clinic website:
"In cases of heavy infestation, larvae can migrate to vital organs, causing potentially dangerous, even fatal, complications, including:
Myocarditis — an inflammation of the myocardium, the thick muscular layer of your heart wall
Encephalitis — an inflammation of your brain
Meningitis — an inflammation of the membranes (meninges) and cerebrospinal fluid surrounding your brain and spinal cord
Pneumonia — an inflammation of your lungs"
Bear meat is delicious, and we never eat it any other way than well-done.
Ted