https://de.wikipedia.org/wiki/MedRxiv

Letzter Satz im Text ... ;-)

Und gleich hinter dem Link selber:

"This article is a preprint and has not been certified by peer review [what does this mean?]. It reports new medical research that has yet to be evaluated and so should not be used to guide clinical practice."

Und in der Studie selber:

"The bivalent COVID-19 mRNA vaccine began to be offered to employees on 12 September 2022. This date was
considered the study start date."

Heute ist der 24. März 2023. Die Hochzeit von COVID war wann nochmal?

Die Studie sagt also genau das, was die Wissenschaft schon länger kommuniziert. Bei den neueren Varianten wirkt die Impfung nicht mehr so gut wie bei den älteren Varianten, gegen die diese Impfstoffe entwickelt wurden.

"Notably, this was a relatively young population, with a mean age of 42 years. Among these, 20686 (41%) had previously had a documented episode of COVID-19 and 13717 (27%) had previously had an Omicron variant infection. 45064 subjects (88%) had previously received at least one dose of vaccine, 42550 (83%) had received at least two doses, and 46761 (92%) had been previously exposed to SARS-CoV-2 by infection or vaccination."