kikipeepers asked
Merck's chickenpox vaccine Varivax not only loses its effectiveness after a while, but it has also changed the profile of the disease in the population. A study confirmed what doctors widely knew - that the vaccine's protection does not last long. And with fewer natural cases of the disease going around, unvaccinated children or children in whom the first dose of the vaccine fails to work have been catching the highly contagious disease later in life, when the risk of severe complications is greater.
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