As a Peace Corps volunteer, Ginny Fonner worked in a rural village in Zambia, a southern African country with a severe shortage of doctors. While there, a short-term mission group visited. Their goal: distribute medicines to fight intestinal worms. “It’s a great goal. Worms are a big problem,” she said during a recent global health symposium at the Medical University of South Carolina. “So they spent day after day going to schools, distributing treatments, feeling really good about it." Except for one thing.