Has Delta Killed the Herd Immunity Dream?
Voice of America
As the Delta variant continues its global surge, experts are questioning whether the long-held goal of achieving herd immunity from COVID-19 through vaccination is still viable.
Herd immunity is achieved when a certain threshold of the global population has either been inoculated against a pathogen or has recovered from infection. But whether or not it is achievable with COVID-19, with the regular emergence of more infectious strains, is up for debate. "If the question is 'will vaccination alone allow us to dampen and control the pandemic?' the answer is: no," epidemiologist Mircea Sofonea told AFP.
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