Az second dose - Should I get my second AstraZeneca dose? Yes, it almost doubles your protection against Delta

A family history of clotting does not appear to be relevant to vaccine risks since the mechanisms are completely different.

Australians are understandably wondering how effective the available Covid-19 vaccines — AstraZeneca and Pfizer — are in protecting against the more transmissible variant.

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There is preliminary data suggesting mixing and matching with Pfizer after a first dose of AstraZeneca may have more side effects, but that it also creates a stronger immune response.