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

A measles vaccine can protect you for a lifetime. Tetanus gives you about 10 years of cover, while flu vaccines need updating every year. When it comes to Covid-19, we’re still not sure exactly how long protection from the vaccine lasts.

BBC Health and Disinformation Reporter Rachel Schraer explains why.

Motion graphics by Jacqueline Galvin.

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