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Pinnacle, NC
A 39-year-old female asked:

How long after first set of vaccines do infants get some protection?

1 doctor answer1 doctor weighed in
Dr. James Ferguson
Pediatrics 47 years experience
Takes time: It usually takes 2-3 weeks for the immune response to kick in & provide basic protection. Their immaturity as new infants means the boost in 6-8 weeks to keep the process going with a 3rd set in another 6-8 wks. By then their immunity will hold into their 2nd yr for the initial vaccines before a booster is needed.
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Last updated Jan 4, 2018

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