Individuals were identified through the literature search and personal contacts using snowball sampling. The contact list was reviewed by country experts to identify the most relevant contacts and facilitate interviews in some cases. All interviews were carried out face-to-face by two interviewers, where one individual took detailed notes. Natural Product Library Interviews were held in the capital cities, lasted one hour, and not digitally recorded. Questions were asked mostly in English with professional

translators used in Taiwan and Russia. In Chile and Mexico, some respondents explained some answers in Spanish in response to questions in English. An interview guide was developed and pretested where questions focused on perceptions of disease burden and the evidence supporting hepatitis A vaccination as well as the decision-making processes for adoption of a Bcl-2 inhibitor hepatitis A vaccine into

national immunization programs. Interviews also assessed respondent beliefs about general policymaker agreement with a series of statements about hepatitis A severity and its vaccine. Detailed interview notes were analyzed by line-by-line coding using ATLAS.ti software. A codebook including a priori research questions was developed and applied. We present numbers of responses among those who answered specific questions. Results are presented in aggregate across respondents to protect the confidentiality of individuals. Analyses were conducted at the country level and by themes across countries. Data from the literature review, internet search and key informant

interviews were analyzed together to identify gaps between the two sources around epidemiological data, economic data and policies around hepatitis A vaccine adoption. For each topic, we compared what was said or reported in the literature with what stakeholders reported. The literature and internet search yielded 797 articles. The initial screening removed 343 articles based on titles and abstracts. Another 114 articles were excluded upon reading of full-length articles. TCL This resulted in 340 articles, or 352 by country, as some articles covered multiple countries (see Fig. 1 for a flow diagram). The majority of included articles were identified through PubMed. India, South Korea and Taiwan (88, 77 and 72 articles) had twice as many publications as Russia, Chile and Mexico (43, 40 and 32 articles). 312 articles discussed the epidemiology of hepatitis A, 36 articles were on policy and 4 articles on economic analyses. While all the articles on India were in English, many of the articles in the other countries were in local languages (Russia 83%, Chile 75%, Mexico 63%, South Korea 47% and Taiwan 13%).