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Vanderbilt University
Vaccine refusal helped fuel Disneyland measles outbreak, study says
Vaccine refusal helped fuel Disneyland measles outbreak, study says

Although epidemiologists have not yet identified the person who brought measles to Disneyland, a new analysis shows that the highly contagious disease has spread to seven states and two other countries thanks to parents who declined to vaccinate their children. Using some simple math, a team of infectious disease experts calculated that the vaccination rate among people who were exposed to the measles during the outbreak was no higher than 86%, and it might have been as low as 50%. In order to establish herd immunity, between 96% and 99% of the population must be vaccinated, experts say. “Even the highest estimated vaccination rates from our model fall well below this...

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