FDA Approves BA.4 and BA.5 Omicron COVID Booster Vaccines Today the FDA authorized the updated Omicron subvariant (BA.4 and BA.5) COVID-19 booster shots manufactured by Pfizer and Moderna; with an anticipated ship/start date of early September 2022. https://t.co/VzQBFgvAqu https://t.co/r0pQuoDVcn