PSMD1 and idiopathic pulmonary fibrosis: Furthermore, IPF patients without prior exposure to SARS-CoV-2 had lower concentrations of anti-S1 IgG antibodies after the 1st dose of the BNT162b2 vaccine than did healthy individuals [43 BAU/ml (17-81) vs. 127 BAU/ml (66-182); p=0.011].