Tapeworm-infected pork. Light micrograph of a section through pork infected by the pork tapeworm (Taenia solium), an intestinal parasite. At left are three cysts or bladder worms (cysticerci) of the pork tapeworm. In its life cycle the pork tapeworm parasite infects humans (its primary host) first and the pig (its secondary host) second. When pork tapeworm eggs from humans enter the pig they form cysts in the muscles, which results in infected pork. If humans eat this, the cysticerci develop into tapeworms in the human intestines. Magnification: x36 when printed at 10 centimetres across.
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