In this Thursday, Jan. 29, 2015, photo, a single-dose of the measles-mumps-rubella virus vaccine live, or MMR vaccine is ready in Northridge, Calif.
In this Thursday, Jan. 29, 2015, photo, a single-dose of the measles-mumps-rubella virus vaccine live, or MMR vaccine is ready in Northridge, Calif. Damian Dovarganes AP
In this Thursday, Jan. 29, 2015, photo, a single-dose of the measles-mumps-rubella virus vaccine live, or MMR vaccine is ready in Northridge, Calif. Damian Dovarganes AP