Which, because you only get five (or ten) words, shows up on the headlines as “Past Covid infection gives 5 months of immunity, study suggests”.
I expect many will read just the headline, and start to claim that it is known that past Covid infection gives exactly 5 months of immunity, and this will become the commonly remembered message going forward.
I didn’t look at the study itself, but how do they know the initial infections were “real” infections? Is it possible they are effectively just finding the false positive rate from the initial infection testing?