I've read Moderna is a stronger MRNA vaccine (100 mcg vs 30 mcg for Pfizer)
So while all vaccines are waning in efficacy, Moderna is holding up much better than Pfizer so you should be okay while you wait for the powers to be to decide on Moderna boosters. My parents are in the same boat.
I've attached an article that discusses Moderna being a stronger MRNA vaccine as compared to Pfizer and holding up better over time. Admittedly, I did not read the entire article because I was just looking for a comparison in their MRNA strength since I had read that previously.
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In response to this post by 3011Cochrane)
Link: Moderna Strength vs. Pfizer
Posted: 10/15/2021 at 2:15PM