The flu vaccines were just a trial run to test proof of concept. And they were hugely successful.
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Says who? I know two in my workplace ( out of a shop of 80) that had to call in sick for two days after the recent flu shot. I won’t even bring in the Covid vax debacle.
You have been warned.
Vaccines *are* supposed to make you mildly sick after taking them. But it shouldn’t last long. If they don’t there is a good chance they aren’t working.