Probably not : If he was has having a reaction to the Tdap the time frame is off. It usually occurs 4hrs - 48 hrs post dose. For the MMRV vaccine that is a live virus vaccine. So if you're getting a reaction it would be because you're having a viremia 7-9 days post dose. There might be associated symptoms such as little vesicles around injection site, runny nose, fever,etc. if worried see his doc.
Answered 9/8/2015
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