People in carceral settings have been disproportionately affected by COVID-19 in terms of the sheer volume of cases, hospitalizations, and deaths. 1,2 Evidence-based strategies to mitigate the risk of viral transmission, including masking, testing, and disinfecting, were slowly and unevenly implemented across prisons, compounding inherent risks associated with overcrowded conditions in congregate settings. In the absence of well-deployed infection prevention measures, the COVID-19 pandemic revealed a pressing need for vaccinating prison staff to: (1) reduce staff morbidity and mortality; (2) reduce staff absenteeism because of isolation/quarantine that can disrupt facility operations; and (3) reduce onward transmission to the vulnerable residents of facilities and the communities where staff live. To date, few carceral systems have provided transparent comprehensive data on staff vaccination that would answer the following question: how successfully has vaccination rolled out among prison staff who interface with residents? This type of data is needed to identify gaps and

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