Az mix pfizer - Which Booster Should I Get? What to Know About Mixing COVID Vaccines
Thailand to mix and match AstraZeneca, Pfizer doses
Pfizer, AZ booster shots can be given at least three months after second dose, says Khairy
‘I got AstraZeneca for my first dose. Which should I get for my second?’ A COVID vaccination guide
Mixing one dose of AstraZeneca and one of Pfizer is safe, but side effects more likely: Study
You are also correct in questioning Canada just changing the expiry dates on Astra Zeneca.
Then the other 800 people can have tested positive for covid but must not have been hospitalized for it or have serious health conditions.
No one needed hospital care.
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