As vaccination rates decline, widespread outbreaks of diseases like measles and polio could reemerge

Health officials in western Texas are trying to contain a measles outbreak among mostly school-aged children, with at least 15 confirmed cases. It's the latest outbreak of a disease that had been virtually eliminated in the U.S., and it comes as vaccination rates are declining — jeopardizing the country's herd immunity from widespread outbreaks.

Tiffany Vargas, a mom who lives in the Tampa area, says her 8-year-old daughter has not received childhood vaccines. That includes vaccines for measles, chickenpox and polio.

"I started doing research, and I saw that a lot of doctors were just having a really hard time answering the questions that I had," Vargas told CBS News.