infographic of pig and sample of its striated muscle tissue under the microscope demonstrating the parasites of

trichinella trichina trichinosis worm trichinellosis roundworm pork piece meat microscope nematoda parasitic infection science spiralis structure medical encapsulated calcific capsule biology anatomy larvae striated muscle muscular tissue animal flesh nematode roundworms trichinae encysted cysts sample disease undercook raw pig red roast steak bacon barbecue lamb