http://www.newsweek.com/astrazeneca-covid-vaccine-explained-approval-america-fda-1575601

Multiple COVID vaccines are now rolling out across the U.S., but one brand has been absent despite approvals by other countries.

That vaccine, by British-Swedish pharmaceutical company AstraZeneca and the U.K.'s University of Oxford, is now known simply as COVID-19 Vaccine AstraZeneca, however was formally called AZD1222. Before that, it was titled ChAdOx1 nCov-19.