A 34-year-old member asked:
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if vaccination protects children from diseases, why can an unvaccinated child infect a vaccinated child?

1 doctor answer
Dr. James Ferguson
45 years experience Pediatrics
Vaccines seldom 100%: The protection provided by vaccines can approach 100% in some cases but not all. Infected kids spread their diseases to infants that are too young to be vaccinated, those that have not completed a full vaccine series or those whose immune system fails to have a full benefit from the vaccine.A measles outbreak in houston was traced to air travelers entering from abroad, 1/3 vaccinated, 2/3 not.
Answered on Aug 28, 2016

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