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If you had a choice, which vaccine would you go for...

Moderna, Pfizer, AstraZeneca or Johnson & Johnson?
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Pfizer - it's the most studied and it's been shown to be fairly effective against Covid variants alpha, beta, gamma, & delta - the main variants of concern. After that I'd take Moderna - probably identical to Pfizer but not as much has been produced or studied. After that, any western nation two dose vaccine.

The ones to avoid: China & Russia vaccines. Both countries have had to have shutdowns of vaccinated cities to control outbreaks - proof their homegrown vaccines aren't effective enough.