One thing that bugs me with studies like this is the lack of prior study. Unless I am unaware, there isn't an ongoing study of a large random group of people to

One thing that bugs me with studies like this is the lack of prior study. Unless I am unaware, there isn't an ongoing study of a large random group of people to determine infection rates, hospitalization/death rates, and antibody levels before and after the vaccine/infection. A robust study like this would also bring clarity to the variant debate. There is no apparent way to know if the people who were breakthrough infections had previously not been infected. It is possible the people who did not have breakthrough infections, may have had previous exposure/infection that prevented the breakthrough. A large, long running random selection study is desperately needed to get any true sense of what has been going on the for the past year+. I am unsure if the University of Padua Vò Study is still ongoing. I hope so.