Many parents of kids ages 5 and under have been anxiously awaiting FDA authorization for vaccines for the youngest age group. Dr. Ruth Karron, one of the world's leading experts in the development of children's vaccines, talks with Dr. Josh Sharfstein about why it's taken so long to authorize vaccines for young children, the evidence behind the safety and efficacy of vaccinating this age group, and what's likely to happen in the next few weeks.
