There's a second chance coming for some people who didn't buy health insurance and would face a big tax penalty for 2015 otherwise. Laughing Stock/Corbis hide caption

itoggle caption Laughing Stock/Corbis

One form of carbapenem-resistant bacteria seen in culture. CRE bacteria are blamed for 600 deaths a year in the U.S. and can withstand treatment by virtually every kind of antibiotic. CDC hide caption

itoggle caption CDC

Measles is highly contagious, and it produces fever and rash in susceptible people who become infected. Hazel Appleton/Health Protection Agency Centre/Science Source hide caption

itoggle caption Hazel Appleton/Health Protection Agency Centre/Science Source

The ParaGuard IUD, which releases copper into the uterine cavity, can last up to 10 years. In clinical studies, the pregnancy rate among women using the device was less than 1 pregnancy per 100 women annually. Mark Harmel/Science Source hide caption

itoggle caption Mark Harmel/Science Source

Dallas insurance agent Jo Ann Charron has worked with clients to help clear confusion over subsidies offered by plans on the federal health insurance exchange. This sort of free guidance can save insurance shoppers time and money, agents say. LM Otero/AP hide caption

itoggle caption LM Otero/AP