“Vaccines protect both the individuals vaccinated and those around them from dangerous diseases (a concept known as “community protection,” “community immunity” or “herd immunity”). That’s because most vaccine-preventable diseases are transmitted from person to person. If a high proportion of the population is vaccinated and immune to a disease then the chains of transmission are broken…. read more here: 2019 State of the ImmUnion: A Report on Vaccine-Preventable Diseases in the U.S.