Why some middle age Americans may need measles booster vaccines

We're taking a closer look at why some adults who were vaccinated against the measles may still be at risk. The CDC has confirmed 704 cases so far this year, mostly in unvaccinated children. Some adults vaccinated in the 1960s may have received only partial immunity from their shots. Dr. David Agus joins "CBS This Morning" to explain.
Source: Health News: CBSNews.com - Category: Consumer Health News Source Type: news