Mapping How The Opioid Epidemic Sparked An HIV Outbreak

A needle exchange program at the Austin Community Outreach Center in Austin, Ind., is aimed at stopping spread of HIV.

Researchers knew the HIV outbreak in the small town of Austin, Ind., was related to IV drug use. Mapping how the virus mutated over time revealed its path — and how it might have been stopped.

(Image credit: Darron Cummings/AP)