No, we’re not talking about that friend who never buys a drink and keeps asking to borrow a fiver. The worst parasites in the world are things like the Taeniasis tapeworm. Although it doesn’t usually cause any symptoms, and the infection is normally only recognised when the worm is passed through stool, this infection’s pretty unpleasant. It’s normally acquired when people eat undercooked meat or freshwater fish that contain tapeworm cysts.
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