While experts said months ago that reaching a level where so many people had either had COVID-19 or been vaccinated against the virus — thus giving them antibodies — was possible, some are now saying that herd immunity might be impossible, citing the spread of variants.
“This month, the Infectious Diseases Society of America estimated that delta had pushed the threshold for herd immunity to well over 80% and possibly close to 90%,” Bloomberg reports. “Public health officials like Anthony Fauci have drawn controversy by shifting the goalposts over the past year, increasing the number of people who need protection before hitting herd immunity. Meanwhile, vaccine hesitancy and supply issues mean most countries won’t get close to even the original numbers.”
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