Differences in the concentrations of anti-S1 IgA antibodies after vaccination in IPF sufferers without prior exposure to SARS-CoV-2 and control group were not statistically significant [0 Units/milliliter (U/ml) (0-20) vs. 19 U/ml (0-206); p>0.05 after the 1st dose; 1313 U/ml (0-54416) vs. 15829 U/ml (2970-116416); p>0.05 after the 2nd dose]. The gene discussed is PSMD1; the disease is idiopathic pulmonary fibrosis.