3 doses, then 1 each year: why Pfizer, not AstraZeneca, is the best bet for the long haul

By Nathan Bartlett, Associate Professor, School of Biomedical Sciences and Pharmacy, University of Newcastle

Last week, the chief executive of Pfizer said anyone who receives its COVID-19 vaccine will probably need to have a third dose within 6-12 months after being fully immunised, and then likely one dose every year going forward.

We’ll need these because it’s likely that, for many of us, immunity will begin to wane within that time frame. The vaccine will also need to be tweaked to cover new coronavirus variants as they emerge.

The advantage…

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