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Vaccination is not 100% effective. People for whom vaccines are not effective rely on the majority of others to be vaccinated so they don't come into contact wi
by aianus 10y ago
Vaccination is not 100% effective. People for whom vaccines are not effective rely on the majority of others to be vaccinated so they don't come into contact with the pathogen.
- todd8 10y agoYes, see for example: http://www.cdc.gov/flu/professionals/vaccination/effectiveness-studies.htm http://www.cdc.gov/flu/professionals/vaccination/effectivene...