In a stark reflection of the seriousness of the threat, England’s deputy chief medical officer, Professor John Watson, said: “I am concerned that in 20 years, if I go into hospital for a hip replacement, I could get an infection leading to major complications and possible death, simply because antibiotics no longer work as they do now.”

About 35 million antibiotics are prescribed by GPs in England every year. The more the drugs circulate, the more bacteria are able to evolve to resist them. In the past, drug development kept pace with evolving microbes, with a constant production line of new classes of antibiotics. But the drugs have ceased to be profitable and a new class has not been created since 1987.

Writing in The Lancet, experts, including England’s chief medical officer, Dame Sally Davies, warn that death rates from bacterial infections “might return to those of the early 20th century”. They write: “Rarely has modern medicine faced such a grave threat. Without antibiotics, treatments from minor surgery to major transplants could become impossible, and health-care costs are likely to spiral as we resort to newer, more expensive antibiotics and sustain longer hospital admissions.”