First, we searched six databases systematically (i.e., MEDLINE, EMBASE, Global Health, EconLit via Ovid, Web of Science, Scopus) in November 2021, using keywords and related MeSH terms and subject headings pertaining to global health partnerships and vaccines: (global public private partnership* or global health partnership* or global health initiative* or public private cooperation* or public private partnership* or public private sector cooperation* or public private sector partnership* or public private alliance* or private finance initiative* or product development partnership* or project finance*) AND (vaccin* or immuni* or immunization programs/ or vaccination coverage/).
We simultaneously conducted an iteratively refined Google Scholar search based on terms related to ‘public-private partnerships’ and ‘vaccines.’ We updated the database and Google Scholar searches in May 2023 to capture recent publications. Lastly, we backward-searched references of eligible articles [17 ].
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