Definition: the pork or trichina worm, a species of parasites that cause trichinosis, found in most regions of the world but more frequently in the Northern Hemisphere; transmission occurs as a result of ingesting raw or inadequately cooked meat (especially pork but now often associated with game animals such as bear or walrus) that contains encysted larvae that develop into adults that survive in the jejunum and ileum for approximately 6 weeks; the female worm is viviparous, and bears approximately 1500 embryonic larvae that are laid deep in the mucosa so that they are picked up in the submucosal capillaries and are transported via the liver to the heart, lungs, and systemic circulation; eventually the larvae break out of the body capillaries, penetrate a muscle fiber, coil, and encyst, thereby inducing the strong sensitization, pain, fever, edema, and eosinophilic reaction characteristic of trichinosis.
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