Elevated CD21^low B Cell Frequency Is a Marker of Poor Immunity to Pfizer-BioNTech BNT162b2 mRNA Vaccine Against SARS-CoV-2 in Patients with Common Variable Immunodeficiency.

In addition, the high responders had fewer concomitant diseases (comorbidity, lung disease, and autoimmunity, as outlined in Table 2 ) as well as fewer immunosuppressive medications, although the differences did not reach statistical significance (Table 2 ).

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