In our series “Why Public Health?” we ask Harvard T.H. Chan School of Public Health students and alumni to talk about what drew them to the field. Selasi Dankwa, PhD ’15, took an early interest in infectious diseases like malaria and cholera, a part of everyday life in her home country of Ghana. She came to Harvard Chan School to study the malaria parasite in the lab. Now she envisions taking her skills and knowledge and returning to Ghana to “make a difference.” (2:35)