Why the AstraZeneca vaccine is delayed in the U.S. despite a widespread global rollout Company has yet to submit data to FDA The Oxford/AstraZeneca vaccine is currently in use in 60 countries. So why isn't it in the U.S. yet? By: KGTV Staff and last updated 2021-03-08 12:07:14-05 SAN DIEGO (KGTV) -- There are now three authorized COVID-19 vaccines in the United States, but what about AstraZeneca? The Oxford/AstraZeneca vaccine is currently in use in 60 countries, according to Our World in Data. This week, the company announced it is shipping doses to another 140 nations as part of the COVAX initiative.