The measles-mumps-rubella vaccine, or MMR, is 99 percent effective at preventing measles, which spreads easily through the air and in enclosed spaces.
The measles-mumps-rubella vaccine, or MMR, is 99 percent effective at preventing measles, which spreads easily through the air and in enclosed spaces. Damian Dovarganes Associated Press file
The measles-mumps-rubella vaccine, or MMR, is 99 percent effective at preventing measles, which spreads easily through the air and in enclosed spaces. Damian Dovarganes Associated Press file