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How many different Covid-19 vaccines do we need?

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www.livemint.com

Do I have a choice in what vaccine I get? Are some better than others?As noted above there are several ways vaccines can end up being different from one another, and only time will tell.

What we know so far is that among the vaccines produced by Pfizer-BioNTech, Moderna and AstraZeneca Plc (working with the University of Oxford), the efficacy in reducing the incidence of severe Covid-19 disease is approaching 100%.

That’s very good. So even though we may not have a choice in which vaccine we take, at least at the start, it is not important in the context of solving the pandemic.

They all seem to work well. If some vaccinations wear off over time or require annual or biennial shots, then the differences between them will become more.

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