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But recent real-world data from the UK suggests that the Oxford/AstraZeneca vaccine might actually be a bit better than Pfizer’s at preventing serious disease and hospitalisation. However, these studies haven’t been set up to avoid
outside biases affecting results. For example, the Pfizer vaccine was rolled out first, so might have been given disproportionately to more vulnerable people. Also, these studies are preprints, meaning they haven’t been checked by other scientists yet.
So whether the Oxford/AstraZeneca vaccine is more or less effective than others at preventing COVID-19 isn’t clear yet.
The important thing to remember is that all the authorised vaccines are safe and offer very good levels of protection against COVID-19. If you’re offered any vaccine, you should take it. ...