Questions today about the risk-benefit ratio of vaccines might just be a product of the vaccines' own success, as many have forgotten their impact on public health.
Measles is extraordinarily contagious, with nine out of ten unvaccinated people around an infected individual likely to contract the illness.
Before the measles vaccine was introduced in 1963, on average, almost every child had contracted the illness by age 15, leading to thousands of hospitalizations and hundreds of deaths annually.
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