It's not just the time to get the shot.
I've seen reports (both in the news and from a friend who has been vaccinated) that the second dose frequently triggers really miserable flu symptoms that last a day or so.
I'd be prepared to take a sick day or two.
And it's probably best for a team -- or a family -- to not all get the shots on the same day.
I am two days past my first COVID vaccine dose and still feel lousy, although I can finally lift my arm up ninety degrees now without a lot of pain and the swelling is mostly gone. I'm dreading what Dose #2 will do.
I know, everyone perkily says "That means your immune system has noticed!" but good grief, I often wish they would make vaccine variants without adjuvants.
Data would be better. From what I've read, more severe reactions are extremely rare.
Not data, not a large sample size, but very consistent and from knowledgeable observers.
This is not unusual for some types of vaccines, however my spouse is a medical professional and we know many PAs, nurses, and doctors that have already gotten the vaccine and it does seem that the rebound effects of the vaccine are more severe than other vaccines. That said, they also reported feeling better in 24 hours or less.
[0] https://www.cdc.gov/coronavirus/2019-ncov/vaccines/expect/af...
[1] https://www.reuters.com/article/us-health-coronavirus-modern...
We still see <1% of those kinds of reactions to dose 2 though.
Which doesn't give you the flu, but can give you (shorter-lived, milder) flu symptoms, because “flu symptoms” are mostly symptoms of the immune response to the flu.