How holes in herd immunity led to a 25-year-high in U.S. measles cases
Author: Aimee Cunningham / Source: Science News Measles is so contagious that the virus can unerringly find the unvaccinated. That knack, combined with the number of people in the United States who haven’t been vaccinated against the disease, has given measles an opening that it hasn’t had in the
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