Dr Michael Ryan, the no-nonsense Irish epidemiologist in charge of the WHO’s health emergencies programme, told people to stop pinning their hopes on the theory as a coronavirus fix-all. Scientists believe that at least 70 per cent of the global population need to have caught and recovered from the virus to induce herd immunity. More optimistic experts estimate that community protection could be established if 40 per cent of people had antibodies against Covid-19. But studies conducted so far suggest only about 10 to 20 per cent of the world’s people has developed the disease-fighting proteins.
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