Comment on Limitations of "Assessing Herpes Zoster Vaccine Efficacy in Patients With Diabetes: A Community‐Based Cohort Study".

The article critiques a study on the effectiveness of herpes zoster vaccination in patients with diabetes mellitus, pointing out limitations such as the use of electronic health records for vaccination status estimation, lack of individual follow-up data, and potential biases in study design. The study's results are questioned due to database issues, missing information, methodological problems, demographic imbalances, and inconsistencies with existing evidence, suggesting that the estimates may not accurately reflect the true association. The authors recommend evaluating dataset limitations for specific analyses and using claims datasets or combined electronic health records/claims data for more accurate vaccine efficacy estimates. [Extracted from the article]