Efficacy of Recombinant Zoster Vaccine in Patients With Inflammatory Bowel Disease.

Background & Aims Individuals with inflammatory bowel disease (IBD) have an increased risk of herpes zoster (HZ) infection. Although the efficacy of recombinant zoster vaccine (RZV) is high among immunocompetent individuals, little is known about its effect among immunosuppressed individuals with IBD. Methods We conducted a retrospective cohort study among individuals in the national Veterans Affairs Healthcare System diagnosed with IBD on or before January 3, 2018, the earliest date of RZV vaccinations. We collected data on 7008 and 26,292 eligible patients with IBD in the 50- to 60-year and >60-year age groups, respectively. We identified veterans who received RZV and compared the incidence of HZ between vaccinated versus unvaccinated individuals. We performed multivariable Cox regression with time varying analysis to determine the risk of HZ among the vaccinated (full dose and single dose separately) versus unvaccinated cohort, stratified by IBD medications. Results The crude HZ incidence rate after full dose vaccination of RZV when compared with the unvaccinated group was lower in both the 50- to 60-year age group (0.00 vs 3.93 per 1000 person-years) and >60-year age group (1.80 vs 4.57 per 1000 person-years). RZV vaccination was associated with a significantly lower risk of HZ among the 50- to 60-year and >60-year age groups, although this was limited by low HZ event rates. Conclusion RZV vaccination was associated with decreased risk of HZ infection among both the 50- to 60-year and >60-year age groups. Greater efforts should be made to vaccinate all patients with IBD with RZV.