Just when it seemed like all the super scary diseases had been discovered—flesh-eating bacteria, brain tapeworms, and, of course, HIV/AIDS, among many others—a new one comes along to bring fresh terror into our hearts. Introducing Chagas disease, which is caused by parasites that get into our bodies by way of blood-sucking insects. Ick. As for what it does, about one quarter of people who have it develop enlarged hearts or intestines which can eventually fail—or worse, burst—leading to death. Gaaah. Naturally, it's very difficult to treat and is normally only curable if caught early.
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