Can first covid-19 vaccines bring herd immunity?
Live MintGovernments and officials are voicing hopes that COVID-19 vaccines could bring "herd immunity", with some calculating that immunising just two-thirds of a population could halt the pandemic disease and help protect whole communities or nations. "Herd immunity is sometimes wrongly understood as individual protection," said Josep Jansa, an expert in health emergency preparedness and response at the Stockholm-based European Centre for Disease Prevention and Control. The ECDC uses an estimated herd immunity threshold of 67% for its models, while Chancellor Angela Merkel said this month that COVID-19 restrictions in Germany could be lifted if 60% to 70% of the population acquired immunity, either via a COVID-19 vaccine or through infection. A better approach, she said, could be to "turn herd immunity on its head", and use the first limited supplies of vaccines to protect those most in need, without worrying about the more robust members of the "herd" who can live relatively happily with the virus.