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A member asked:
What's the difference between the first mmr vaccine, and the second dose?
4 doctors weighed in across 2 answers
Nothing: The second dose contains the same attenuated viruses as the 1st. It became recommended when it was found that the 'failure' rate with one shot was as high as 5% with measles protection.
Answered 5/25/2017
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No difference: It is the same vaccine given at 12 months old.A second dose is required to boost your immunity (higher protection rate) to these very contagious diseases with bad outcome when contracted.
Answered 5/25/2017
5.6k views
Thank
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