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Choirs have been at the centre of several outbreaks of coronavirus, in Berlin and Washington for example. After the Amsterdam Mixed Choir in the Netherlands performed Bach's St John Passion in March, 102 out of the 130 choristers became ill – several needed intensive care and one died. We tend to assume it's the singing itself that's the problem, but do we know that for sure? Margaret McCartney explores the question with Professor Jackie Cassell, a specialist in sexually transmitted infections and public health. (Image: Lithuanian choir, Credit: Getty Images.)