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I'm curious to know how much the reaction to the second or subsequent jabs correlates to antibody/immunity level. I had no reaction to the first jab and a 12-hour flu-like reaction to the second jab the next day (both Moderna).

NOT having a similar reaction to a third booster would be concerning, but I wonder how much the reaction actually correlates with protection for shots beyond the first.

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Good question. I think the consensus is that the two things are not related. That is the reason I argued for vaccination and testing for immunity as a single combined action for each individual.

"No, vaccine side effects don’t tell you how well your immune system will protect you from COVID-19"

https://theconversation.com/no-vaccine-side-effects-dont-tel...

for what its worth, I had AZ as my first shot and it was pretty rough for 36 hours and then I was fine. My second shot of pfizer 8 weeks later barely left a sore spot on my arm. Not sure what if anything it means, but curious what will happen if I get a 3rd.

I had 2 shots of AZ but the same experience. Rough initial period, but the second one was fine. I don't plan to get a third one until they make an updated vaccine for the newer variants like delta. What's the point if it's the old vaccine?

Data from Israel shows that a third pfeizer dose is highly effective against delta.

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