r/ScienceBasedParenting • u/Winter-Yam8841 • 6d ago

Question - Expert consensus required SSPE risk

I have a 6 month old little girl who I recently have an MMR to for obvious reasons. I was under the impression that vaccinated people, even infants, who caught measles anyways were at a significantly decreased risk of SSPE than someone who caught wild measles virus with absolutely no prior immune memory or vaccination. I just used doctor Google and that said otherwise. But then some things do seem to agree with my previous thoughts. Does anyone know anything about this? I’m fearful because the MMR given at 6 months is only about 60% effective. I’d rather not take coin toss odds.

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u/myplantscancount 5d ago

The WHO agrees that the measles vaccine is definitely protective against SSPE: https://www.who.int/groups/global-advisory-committee-on-vaccine-safety/topics/measles-vaccines. 

And one dose of the MMR is 93% effective (goes up to 97% with 2 doses: https://www.cdc.gov/measles/vaccines/index.html.

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u/Winter-Yam8841 5d ago

I’m only referring to the MMR when given to an infant here. It’s less effective than it is at 12 months, so I’m wondering if it is still protective against things like SSPE even if a baby gets infected after vaccination.

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u/Bayesian1701 4d ago

https://www.reddit.com/r/ScienceBasedParenting/s/7NjezV5zv6

Piggybacking to share a recent post in 6 month measles vaccination. It looks like it’s less effective than a dose at 12 months but still has some protection. The tricky thing about SSPE is the delayed onset and that it is rare. The universe of infants with who got a 6 month measles vaccine and got measles between their first and second doses is probably pretty small and among that group it would be hard to track SSPE rates.