Q: It looks as if Covid-19’s exponential spread is going to continue. What can I do to make sure my immune system remains strong?

A: Last week we spoke about whether it was safe to go to the gym. In the week that followed, two Virgin Active gyms were shut down after members tested positive and the facilities underwent an intensive cleansing. A spokesperson told Business Insider: “We have not seen any retailers, restaurants or shopping centres do the same.”

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