limitations of confounding factors and systemic errors from
under-reporting, erroneous reporting, multiple exposures, or
multiple outcomes.27 In our study, we have taken care to match
the cases to controls to account for possible confounding by
age and gender. We have also evaluated all the cases for double
reporting. However, there might still be unknown confounders
and some adverse events may be coincidental. It is important
to note that, even though the VAERs database may be used to
document any possible associations, it does not establish any
cause and effect relationship between vaccines and adverse
events. In conclusion, the present study demonstrated that zoster
vaccination carries no increased risks of severe autoimmune
adverse events. Although there were reports of SAAEs after
zoster vaccination in the VAERS database, they did not occur
more frequently than other vaccines. Therefore, dermatologists
and primary care physicians should encourage more zoster
vaccine use in elderly patients, including selected patients with
autoimmune diseases. More follow-up studies or assessment
of other vaccine safety databases should be performed to better
evaluate the association.
DISCLOSURES
The authors declare that they have no conflicts of interest.
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AUTHOR CORRESPONDENCE
Yik Weng Yewyikweng.yew@mail.harvard.edu