Also Read | Battered infra dream awaits a new dealU.S. President Joe Biden said on Tuesday that the United States aims to secure an additional 200 million doses of COVID-19 vaccines from Pfizer and its partner BioNTech and Moderna Inc by summer.In Europe, the European Commission is setting up a proposal to restrict COVID-19 vaccine exports amid frustration over delays in deliveries of AstraZeneca's vaccine and other supply problems."Most developing countries will not have widespread access to the shots before 2023 at the earliest," Agathe Demarais, director of the Economist Intelligence Unit, the research division of the Economist Group, said in its study."Some of these countries—particularly poorer ones with a young demographic profile—may.