“…We identified a total of 26 articles that discussed incentives and vaccination, including vaccines for SARS-CoV-2 (12 studies) [22] , [23] , [24] , [25] , [26] , [27] , [28] , [29] , [30] , [31] , [32] , [33] , hepatitis B (2 studies) [34] , [35] , HPV (2) [36] , [3] , maternal tetanus (3) [38] , [39] , [40] , influenza (5) [41] , [42] , [43] , adult tetanus, pneumococcus, and influenza (1) [46] , and a mix of different vaccinations (1) [47] . Target groups, if specified, included adolescents (2), students (2), elderly (2), health and social care workers (2), people with substance misuse disorders (1), and people who inject drugs (2).…”