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Coronavirus: what is the difference between an antigen and antibody test?

With the coronavirus making headlines all over the world, officials have stressed the importance of both antigen and antibody tests in getting a handle on the pandemic.

Boris Johnson claimed antibody tests have the potential to be a “total game changer”, while health secretary Matt Hancock reassured 3.5 million devices are on their way to the NHS.

But what actually is the difference between an antigen and antibody test?