Watch Shacara Johnson, epidemiologist for the Centers for Disease Control (CDC) in Atlanta share how if a girl wants to be a "disease detective" and investigate the who, what, when and how of an illness, then a career in epidemiology is for them. She gets to work with team members from around the world to develop mathematical models that analyze the spread of disease. For her, the most rewarding part of her job is helping the CDC fulfill its mission of addressing health, safety and security threats both in the US and around the world.