Influenza A (H1N1)v vaccines are well tolerated in patients with IBD. Non-adjuvanted vaccines are associated with fewer local reactions. The risk of IBD flare is probably not increased after H1N1 vaccination.
Rahier, J.-F., Papay, P., Salleron, J., Sebastian, S., Marzo, M., Peyrin-Biroulet, L., Garcia-Sanchez, V., Fries, W., van Asseldonk, D. P., Farkas, K., de Boer, N. K., Sipponen, T., Ellul, P., Louis, E., Peake, S. T. C., Kopylov, U., Maul, J., Makhoul, B., Fiorino, G., et al. (2011). H1N1 vaccines in a large observational cohort of patients with inflammatory bowel disease treated with immunomodulators and biological therapy. Gut, 60(4), 456-462. https://doi.org/10.1136/gut.2010.233981 (Original work published 2011)