Leadership of the CDC's new vaccine advisory committee announced the creation of two new workgroups, including one looking at the cumulative effects of the childhood vaccination schedule.

At the first meeting of a controversial new group of vaccine advisers to the US Centers for Disease Control and Prevention, the committee announced new plans to study established vaccine guidelines.

The advisory committee makes recommendations to the Centers for Disease Control and Prevention on the nation’s vaccine schedule. Any changes could affect vaccinations for millions of children.