Just to get back on-topic…
Had the 1st AZ 4 days ago, 2nd due in ~5 weeks. 1st 12hrs, nada, felt fine. Then got chills, restless sleep, woke up feeling like I had a low-grade flu, no energy. Injection site felt like a bruise.
Next day, sorted, all good. Injection site still a little tender.
Overall, nothing to report here. A non-event. Nothing to fear. Grateful to have a level of protection against this nasty disease, for myself & my family.