Appointments and second doses are guaranteed for those individuals who got their first shot at State Farm Stadium, Arizona's large-scale state-run site, officials say.
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.
National figures as of June 5 show that 2.
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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.