Longterm Effectiveness of Herpes Zoster Vaccine among Patients with Autoimmune and Inflammatory Diseases
Huifeng Yun1,2, Fenglong Xie1,2, John W Baddley1,2
1From the University of Alabama at Birmingham, Birmingham, Alabama; Oregon Health and Science University, Portland, Oregon, USA.
Objective:
The protection duration of herpes zoster (HZ) vaccination is unclear among patients with autoimmune (AI) diseases.
Methods:
Using 2006-2013 Medicare data, HZ vaccinated patients with AI were matched 1:2 to unvaccinated HZ. Incidence rates (IR) and adjusted risk ratios over time were calculated using Poisson regression.
Results:
Of 59,627 vaccinated patients, crude IR increased from 0.75/100 person-years during the first year post-vaccination to 1.25 during the seventh year. Vaccinated patients had a significantly lower risk of HZ compared with the unvaccinated through 5 years.
Conclusion:
HZ vaccination was significantly protective only for about 5 years among patients with AI.
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