Shimray Wungreichon, 43, smiles into the camera after being administered the COVID-19 vaccine at the District Hospital in Ukhrul, in the northeastern Indian state of Manipur, Saturday, Jan. 16, 2021. Vaccine hesitancy has been a major concern as India started inoculating health workers Saturday in what is likely the world's largest COVID-19 vaccination campaign, joining the ranks of wealthier nations where the effort is already well underway. But Wungreichon is prepared. "As a health worker, this is a time when the world wants us to act,” she said.(AP Photo/Yirmiyan Arthur)