Both can be true if ~10% of the population do not have a "typical immune response" to the vaccine. This can be due to a number of factors such as age, preexisti

Both can be true if ~10% of the population do not have a "typical immune response" to the vaccine. This can be due to a number of factors such as age, preexisting conditions, general health, etc. Plus the immunity from vaccination "wears off" over time, and some of the earliest recipients are now 8+ months post vaccination.