Covid: Why do some vaccines shield you for longer than others?

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A measles vaccine can shield you for a lifetime. Tetanus provides you about 10 years of canopy, whereas flu vaccines want updating yearly. In terms of Covid-19, we’re nonetheless undecided precisely how lengthy safety from the vaccine lasts. BBC Well being and Disinformation Reporter Rachel Schraer explains why.Movement graphics by Jacqueline Galvin.

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