Since the introduction of antibiotics doctors have prescribed courses of treatment that typically ran longer than necessary but bacterial resistance is forcing a reevaluation.
Mosquito-transmitted Zika virus has arrived in Central and South America, and while most people are not affected by it, the virus has been linked to microcephaly, a severe birth defect. Experts discuss the virus, how it's transmitted, its spread to the US, and how to protect yourself from it.