PSMD1 and infection: In contrast, for patients who had been vaccinated against SARS-CoV-2 before Omicron infection (n = 10) (BTIs), the Roche Elecsys anti-SARS-CoV-2 anti-S1 assay detected a 400-times higher median specific antibody concentration (p < 0.0001) compared to patients referring to the beginning of the pandemic.