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I’m wondering if what I experienced were secondary symptoms to my system perceiving itself as overrun by the first shot. In other words, were the muscle pains and digestive discomfort not a direct, first-order reaction to the shot, but rather a compounding result of my system getting preoccupied with having to weather a flu-like aftermath from the first shot? For instance, if overexerting yourself while battling the flu, your back and muscles are likely to feel a lot worse than sore, as mine sure did over the weekend.

It's possible. They do say that having side effects from the shot is an indication that your immune system is reacting to it, which is what you want to happen. Maybe your immune system went into hyperdrive and it had secondary effects. I haven't heard of severe symptoms like that, though, so it's odd regardless.

Either way, glad you're feeling mostly better, and hope it continues to improve quickly. 

I don't know that we can conclude that from the data.

The truth is, that the virus has evolved, and will continue to evolve.  Since Delta has become the prime variant in the USA, there's no way to know how the vaccines would have held up against the variants that were prevalent when the vaccines first reached the public.

Regardless, I don't think it matters, because the effect is the same.  We know that vaccinated individuals are more likely to contract COVID19 as time goes on.  If this is because the virus has mutated, and we can assume at this point that the virus will continue to mutate, then that implies the potential for even further decrease in efficacy. 

But I'm far less interested in protection against contracting COVID19, and far more interested in keeping people out of the hospital.  On that front, at least, the vaccines are still proving to be quite effective.

Ed Zachery

my younger brother, 56, says the shingles vaccine is much worse

Mrs. 847 got that on Sunday.

Muscle cramps/tightness. I did a lot of PT for her this AM. Couldn't walk at 7AM, and just left the hotel in heels and a sundress. 

I hear all of that, but I can't wait. I'm 43 and I've now had shingles twice. Luckily both were minor cases, but as soon as I turn 50 I'm getting it. 

Don't wish away 7 years man. Just hope you don't get it.

I think we all appreciate how bad shingles can be.  The shot is highly advised.

Yes, it can, it hit my kid hard at 32.  But I think it tends to be bad less often than shingles, I'm not sure of that.