Photo: Light micrograph of the scolex of an adult pork tapeworm (Taenia solium). At the top are the hooks, at lower left and right are the rounded suckers. These are used by the tapeworm to attach itself to the intestinal walls of its host. Humans are the main host of this parasite, which infects some four million people worldwide. (Photo by ©Alfred Pasieka/Science Photo Library/Photo Researchers, Inc. Reproduced by permission.)
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