I think that the fact that they didn't find the typical lung damage associated with Chinavirus they believe that the vaccine may have blunted the symptoms. The Vax will not prevent the spread of the virus throughout the body but is supposed to mute the symptoms. Anecdotally, my in-laws got the Pfizer jab and a few months later they got the Chinavirus. They did well with it, but... I gave they HCQ/ ZN/ZPac. I wasn't gonna take any chances. Everything else they found is typical of an octagenarian with those comorbidities