An in-depth look at what’s causing the measles to makes a comeback in the U.S.

Despite being declared eliminated in 2000, measles cases are rising across the U.S., with 36 instances identified in 16 states since January. Florida emerged as a hotspot with nine cases, as the state’s surgeon general challenges CDC vaccine guidelines. CBS News’ chief medical correspondent Dr. Jon LaPook provides an in-depth analysis of this alarming development.