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This Paper Examines Empirically The Determinants Of Covid-19 Vaccine Rollouts And Their Effects On Health Outcomes. We Assemble A Comprehensive And Novel Cross-country Database At A Daily Frequency On Vaccinations And Various Health Outcomes (new Covid-19 Cases, Fatalities, Intensive Care Unit (icu) Admissions) For The Period December 16, 2020-june 20, 2021. Using This Data, We Find That: (i) Early Vaccine Procurement, Domestic Production Of Vaccines, The Severity Of The Pandemic, A Country’s Health Infrastructure, And Vaccine Acceptance Are Significant Determinants Of The Speed Of Vaccination Rollouts; (ii) Vaccine Deployment Significantly Reduces New Covid-19 Infections, Intensive Care Unit (icu) Admissions, And Fatalities, And Is More Effective When Coupled With Stringent Containment Measures, Or When A Country Is Experiencing A Large Outbreak; And (iii) Covid-19 Cases In Neighboring Countries Can Lead To An Increase In A Country’s Domestic Caseload, And Hamper Efforts In Taming Its Own Local Outbreak. Pragyan Deb, Davide Furceri, Daniel Jimenez, Siddharth Kothari, Jonathan Ostry, Nour Tawk.