Chagas disease has been described as the new HIV/AIDS for the Americas. But chagas disease is not new. The disease is named after the doctor who described it in 1909. So how dangerous is chagas disease for Americans? The disease is caused by "kissing bugs" or "assassin bugs", and the bugs attack humans on their lips (hence the name) during the night. While the kissing bug is chewing on your face it is also defecating, which is how the disease is spread. Chagas disease is typically not considered a major threat