Leveraging Community Health Workers and a Responsive Digital Health System to Improve Vaccination Coverage and Timeliness in Resource-Limited Settings: Protocol for a Cluster Randomized Type 1 Effectiveness-Implementation Hybrid Study

Lavanya Vasudevan   ^{1, 2 *} , CPH, MPH, PhD ;   Jan Ostermann   ^{2, 3 *} , PhD ;   Nathan Thielman   ^{2, 4} , MD, MPH ;   Joy Noel Baumgartner   ⁵ , PhD ;   David Solomon   ⁶ , MD ;   Anna Mosses   ⁶ , MD ;   Amy Hobbie   ² , MPH ;   Nicole L Hair   ³ , PhD ;   Chen Liang   ³ , PhD ;   Marco van Zwetselaar   ⁷ , MSc ;   Sayoki Mfinanga   ⁶ , MD, PhD ;   Esther Ngadaya   ^{6 *} , MD, PhD

¹ Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, United States

² Duke Global Health Institute, Duke University, Durham, NC, United States

³ Department of Health Services Policy & Management, Arnold School of Public Health, University of South Carolina, Columbia, SC, United States

⁴ Department of Medicine, Duke University, Durham, NC, United States

⁵ School of Social Work, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States

⁶ National Institute for Medical Research, Muhimbili Research Centre, Dar es Salaam, United Republic of Tanzania

⁷ Zwets IT, Harskamp, Netherlands

*these authors contributed equally