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Vaccination is an important strategy to reduce the infection rate and adverse events of coronavirus disease 2019 (COVID-19). However, the effect of COVID-19 vaccination for Japanese patients with inflammatory bowel disease (IBD) has not been fully elucidated. In the present study, we investigated the serum titer of neutralizing antibodies after COVID-19 vaccination in patients with IBD, treated with and without immunosuppressive therapy. The study consisted of 108 patients with IBD [76 with ulcerative colitis (UC) and 32 with Crohn's disease (CD)] from the gastroenterology outpatient clinic at the Hospital of the Kyoto Prefectural University of Medicine who underwent anti-severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccination. The control group included 64 healthy subjects who received the anti-SARS-CoV-2 vaccine. When 10 AU/ml of neutralizing antibodies was used as cut-off value, the positive rates of neutralizing antibodies of patients with UC, patients with DC, and the control group were 97.3%, 84.3%, and 100%, respectively. The neutralizing antibody titer showed no difference between patients treated with and without immunosuppressive therapy. These results indicate that COVID-19 vaccination may be useful in patients with IBD, treated with or without immunosuppressive therapy.

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