How well do vaccines work? Research reveals measles vaccine efficacy lower than expected | EurekAlert! Science News

"What we found was a bit of a shock - there are a very small number of studies that test whether vaccines are effective across multiple pathogen doses. We reviewed almost 6,000 articles and identified only about a dozen studies that had tested vaccines across multiple pathogen doses. Within those few studies, the pattern was generally consistent with our simulation - vaccine efficacy tended to be lower at high pathogen doses," said Langwig.

There is no dosing difference between an adult and a child for most vaccines. They are NOT 100% in ANY form or fashion.

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