Pharmacists' Willingness to Offer Vaccination Services: A Systematic Review and Meta-Analysis.

Pharmacy-based vaccination (PBV) services increase coverage and enhance access to lifesaving vaccines. This systematic review assessed the proportion of pharmacists willing to offer PBV services. PubMed/MEDLINE, CINAHL, EMBASE and Scopus electronic databases were searched from inception to identify relevant literature. Google scholar and other sources of grey literature was also searched. The literature findings were synthesized narratively, and via a random-effects meta-analysis. Risk of bias was evaluated using nine quality assessment criteria adapted from the Joanna Briggs Institute checklist for prevalence studies. The review protocol is registered on PROSPERO (REF: CRD42021293692). In total, 967 articles were identified from the literature search. Of this, 34 articles from 19 countries across 5 WHO regions were included in the review. No article from the Western Pacific WHO region was identified. Most of the included studies (n = 21, 61.8%) showed an overall low risk of bias. None showed a high risk of bias. Pooled willingness for PBV services was 69.45% (95% CI: 61.58-76.33; n total pharmacists = 8877), indicating that most pharmacists were willing to offer the service, although nearly a third were not. Pharmacists' willingness was highest in the Americas (71.49%, 95% CI: 53.32-84.63, n pharmacists = 3842) and lowest in the African region (58.71%, 95% CI: 45.86-70.46, n pharmacists = 1080) although the between-group difference was not statistically significant across the WHO regions (Q = 3.01, df = 4, p < 0.5567). Meta-regression showed no evidence (R² = 0%, p = 0.9871) of the moderating effect of the type of vaccine assessed, PBV service availability, sampling technique and the study risk of bias. These findings show that most pharmacists are willing to offer PBV services; however, strategies that will enhance greater involvement in service provision are needed.