Getty Images“Now, because antibodies are lower, a higher dose [of the virus] is getting through and causing a more severe bout of disease,” Prof Riley says.
Antibody levels are relatively low because it has been a long time since many of us were vaccinated (if you are young and healthy you were only ever offered two doses and a booster) or infected, which also tops up immunity.
Prof Peter Openshaw, from Imperial College London, told me: “The thing that made the huge difference before was the very wide and fast rollout of vaccines – even young adults managed to get vaccinated, and that made an absolutely huge difference.”


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