<strong>Chagas disease, aka T. cruzi: </strong>This nasty disease comes from a bug called a triatomine that's infected with the Trypanosoma cruzi parasite. The CDC estimates there are at least 300,000 people living with the disease in the U.S. right now, but they may not know it. It unusually takes years of chronic infection before heart disease, heart failure and gastrointestinal problems begin.<br />
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