There's a lot of angry misinformation going around on both sides about this vaccine. Perhaps we can have a serious Q&A thread. In this thread we simply ask questions and answer them. We don't try to explicitly say whether the vaccines are safe and effective, or whether they do or don't cause cancer or Aids or anything.

Il'l start:

1) Why do the vaccines have waning efficiency? We know the flu shot has waning efficiency because it mutates quickly enough that your body can't recognise next years virus even though it's immune against this years virus. Is that the case with COVID?

2) Are the 2 shots and the booster, chemically different from each other in any way? or is it 3 spaced exposures to the exact same substance?