Thank you for attempting to dissect the data, rather than berating the other “side”. We all would do better to quote and discuss actual study findings. Repeatedly posting links and demanding to know if people are paying attention isn’t helpful. Same goes for the sarcastic post alluding to this
study.
The study is interesting, but subject to several limitations. The authors do a decent job summarizing most of them:
Number 2 is especially problematic. As the data are partitioned, there are probably many, many individuals with prior infection who were misclassified as uninfected. These likely were people with mild to no symptoms, who never felt a need to seek medical care, or obtain a formal diagnosis. And it’s tough to be classified as reinfected if you never knew you were infected in the first place.
The problem is, those same people are arguably more likely to be reinfected than those who were symptomatic/sought medical care with initial infection (in very crude terms, less symptoms ~ less immune response). Unless you perform serial surveillance of a population (as has been done in other countries, eg. Denmark), it’s hard to get a true handle on reinfection risk.
In contrast, it’s very easy to keep track of vaccinations. I’m not really sure I follow how the “conservative bias” of this study could magnify the difference between breakthrough and reinfection rates, but I’m open to someone explaining it to me.
Moreover, because we know a subset of people (roughly 5-20+%, depending on the study) don’t generate antibodies following covid-19, it’s really tough to bank on natural immunity for any given individual. All these studies people are using to enable skipping/delaying vaccination still find infected + vaxxed have the lowest risk of recurrent infection, though the durability of hybrid immunity remains unclear.
With all that in mind, I don’t find the arguments against vaccinating and boosting those with prior infection very compelling. And for those of us who are paying attention, nobody is recommending boosting everyone every four months, so the
theoretical concerns raised by the European group are fairly meaningless.