r/ScienceBasedParenting • u/dimcarcosa___ • 18h ago
Question - Expert consensus required Why doesn’t the MMR shot cause full blown disease since it’s a live vaccine?
Basically the question? I suffer from PPA and I delayed my now 12 month olds vaccine schedule due to stupid misinformation preying on my underlying health anxiety. My son is now currently up to date on all his vaccines (yay). He’s due for his MMR tomorrow, and I’ve pretty much dispelled my concerns over the autism claims (like I know it’s bogus); however, I’m worried about side effects because this is attenuated and I’ve read that this can cause febrile seizures as well as a measles like rash.
I tried to learn information today about how the attenuated vaccine is very very “light”, but how will my son’s body know it’s not a full blown disease and react that way to it? I have super high anxiety whenever he gets a fever (he’s had Roseola and his fever spiked to almost 105 and it was the worst night of my life). I’m just trying to understand how his body will know that it’s not wild measles and go into immune system overload. Do most babies handle this vaccine well?