Among the 469 cases in Massachusetts residents, 346 (74%) occurred in persons who were fully vaccinated
Vaccine - substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease.
So 469 people in a state with a population of 6,900,000?
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