Freezing will kill this microscopic worm, unlike bacteria. It was a steak tar-tar with various herbs and spices that was served on rye bread with capers. Thanks in advance. Very common in Germany and also called Thueringer Mett, sometimes filled into casings and cold smoked. A potentialy lethal and debilitating disease causing micro organism.
Trichinosis can also be present in other animals, like bear and deer.
It is transmitted by rat feces. Deer and bear that roam garbage dumps can pick it up through rat droppings. However, the pigs are usually raised in clean surroundings and that will exclude rat infestation. Freezing will kill this microscopic worm, unlike bacteria.