7:40ABC NewsJanuary 24, 2021Herd immunity by September 'an ambitious goal': Dr. Vivek MurthyGeorge Stephanopoulos interviews surgeon general nominee Dr. Vivek Murthy on "This Week."Up Next in newsPublic health expert speaks on multiple new COVID-19 variantsJanuary 24, 202120 million doses of the coronavirus vaccine have been administered in the USJanuary 24, 2021The 2024 total eclipse seen across North AmericaApril 8, 2024