This is a method employed to detect infections with Trichinella spiralis in pork muscles by depressing a small piece of the muscles of the diaphragm. Muscle larvae will become visible when examining the slide by the help of light microscopy. Trichinelloscopy was worldwide used in Prussia (an eastern region of Germany around 1850, when the famous scientist Virchow initiated trichinelloscopy by law, since many people died during these times due to trichinellosis. Today diagnosis on Trichinella infection of porks is done at all only in a few numbers of countries (e.g., Germany). Today portions of muscles of about 10–20 pigs are digested together by trypsin incubation, and after centrifugation the sediment is examined by the help of a light microscope for Trichinella larvae. In case of a positive result, each pig of the group is controlled separately in order to find out the infected ones, which then will be taken out.