Back in January, 12-36 hours after Moderna #2: fever to 101.5 peaked at 24 hours, could barely leave bed or eat.
Caught me by surprise, and many others reported similar. That RNA works!
As I'm sure you've heard, radiologists are also incidentally seeing enlarged lymph nodes especially in vicinity of the shot, and even recommend deferring elective / screening imaging because it can raise false alarms of malignancy.