Increasing the amount of testing for COVID-19 is the best way to see how widespread the outbreak is. South Africa recently approved its third kind of coronavirus test — an antigen test. But how does it work and what sets it apart from the others on offer?

Increasing the amount of testing for COVID-19 is the best way to see how widespread the outbreak is. South Africa recently approved its third kind of coronavirus test — an antigen test. But how does it work and what sets it apart from the others on offer?
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