I actually suspect this is true, which means this isn't even the Flu Bro. It's on par with e-coli from a batch of bad lettuce.
They are looking at whether the Neanderthal chromosome #3 or the Alzheimer Gene make a difference as to how your body reacts to the virus.
Neanderthal issue is more common in Europeans
There are probably multiple genetic quirks that make you susceptible. Whether they find them or not is another story.
O blood and Alzheimers
O blood and Covid
O blood and Malaria
Maybe Covid will help them find a clue as to Alzheimers