From the Background: "The Coronavirus Disease 2019 (COVID-19) pandemic has led to severe health and economic consequences across the globe, as governments work to contain the spread of the virus and its variants. In late 2020, researchers started identifying several COVID-19 variants, now driving surges in related cases and deaths across Africa and south Asia. The United States, India, and Brazil have the highest number of confirmed COVID-19 cases, many caused by the Delta variant. Vaccines and other countermeasures play a growing role in COVID-19 control. However, insufficient access to vaccines in many low- and middle-income countries (LMICs) raises questions about how inequities may hinder pandemic control worldwide."
CRS In Focus, IF11796
Congressional Research Service: https://crsreports.congress.gov/