Rhett Krawitt, 6, who could not be vaccinated while he was being treated for leukemia, speaks to lawmakers about approval of a measure requiring California schoolchildren to be vaccinated during a hearing of the Senate Education Committee on April 15, 2015.
Rhett Krawitt, 6, who could not be vaccinated while he was being treated for leukemia, speaks to lawmakers about approval of a measure requiring California schoolchildren to be vaccinated during a hearing of the Senate Education Committee on April 15, 2015. Rich Pedroncelli AP
Rhett Krawitt, 6, who could not be vaccinated while he was being treated for leukemia, speaks to lawmakers about approval of a measure requiring California schoolchildren to be vaccinated during a hearing of the Senate Education Committee on April 15, 2015. Rich Pedroncelli AP