As thousands of UK students prepare to return to University, data now shows the highest number of detected infections of coronavirus is in young people. A leading epidemiologist said today she believes the country is at a "critical moment" in controlling the spread of the virus. In Leeds, people have been urged to socialise "sensibly and responsibly" this weekend, after the city was added to a government watchlist of areas with high rates of infection. Kate Silverton introduces this report from our correspondent Richard Galpin.

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