Not realistic, Denmark, Iceland say vaccination has not led to herd immunity
Before the emergence of more contagious coronavirus variants, estimates placed the threshold for herd immunity at between 60 to 70 percent of the population.
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'It's mythical': COVID jab will never result in herd immunity, warns UK's top vaccine boss
Sir Andrew Pollard, director of the Oxford Vaccine Group, said herd immunity is 'not a possibility' with the current Delta variant.