One dose of AZ’s COVID
Should I have my AstraZeneca booster shot at 8 weeks rather than 12? Here's the evidence so you can decide
Pfizer AstraZeneca long term effectiveness study
Protection kicked in at 14 days and was.
On 11 March 2021, the temporarily suspended the vaccine's use, awaiting more information regarding potential adverse effects.
I think it is definitely time to update the vaccines to match omicron.