ABSTRACT
Objectives: To determine the impact of a pharmacy-based, clinical decision support (CDS) tool on herpes zoster (HZ) vaccine series completion during the initial months of the COVID-19 pandemic across the US. Method(s): In partnership with Kroger Health, a pharmacy CDS tool alerted staff of patients due for their second HZ vaccine dose, which had been accompanied previously by a timed text message. Once operations changed due to COVID-19, the system limited outreach to only patients visiting the pharmacy. Primary outcomes included the proportion of patients receiving both doses within a Kroger-owned pharmacy (n=2,293) and the number of days between doses, both within and across two 32-week periods before and after the pandemic hit the US. Generalized estimating equation-based (GEE) logistic and linear regression models determined differences in completion rates and time to completion. Result(s): During the observation period, 38,937 adults received at least one HZ vaccine dose, with 77.2% receiving both doses. Patients engaged by the CDS tool achieved 80.5% dose completion, versus 65.4% of those not intervened (p<0.0001), which was lower than in the period immediately before the pandemic (85.8%, p<0.0001). The dosing window averaged 119.4 days (SD: 26.91), which was the longest timeframe between doses since the HZ vaccine was launched and nearly one month longer than before the pandemic (93.0 days [SD: 28.02], p<0.0001). The odds of dose completion increased in areas of higher health literacy (OR: 1.01;95% CI: 1.007-1.014), but decreased in areas of higher poverty (OR: 0.992;95% CI: 0.988-0.995). Time to completion was slightly shorter (B=-0.04, p<0.05) in areas of higher health literacy. Conclusion(s): Despite changes in clinical processes, a nationwide community pharmacy was successful in completing HZ vaccine dose series for adults during the pandemic, suggesting that processes in community pharmacies can protect staff while remaining committed to providing preventive health services during public health crises.Copyright © 2023