Immunology experts have criticised the British Government's strategy of allowing large numbers of people to become infected with coronavirus to develop "herd immunity" so that the more vulnerable do not contract the disease.
On Friday, Sir Patrick Vallance, the chief scientific adviser, said the aim was to "broaden the peak" of the illness but not suppress it, adding that if many people caught it and became immune then transmission would stop.
He suggested that around 60 per cent of Britons would need to become infected to develop herd immunity and protect those most at risk.
Yesterday UK Secretary of State for Health and Social Care Matt Hancock appeared to backtrack on the idea, stating that "herd immunity" was a "scientific concept" rather than the Government's goal or policy.
In a letter to the Health Secretary, Sir Patrick and Prof Chris Whitty, the Government's chief medical officer, the British Society for Immunology (BSI) warned there could be "severe consequences" of infecting large numbers of people when knowledge of the virus was still so limited. "We don't yet know if this novel virus will induce long-term immunity in those affected as other related viruses do not," said Arne Akbar, the society president. "Therefore it would be prudent to prevent infection in the first place."