The comments cast even greater doubt on the feasibility of achieving so-called herd immunity, which is reached when enough of the population has developed immunity against the virus so that it cannot efficiently spread.
Most scientists say 60% to 80% of the population needs to be vaccinated or develop antibodies through natural infection to achieve herd immunity,Critics of business closures and public health restrictions meant to curb the spread of the virus have pointed to herd immunity without a vaccine as a potential solution to the pandemic. However, WHO officials and many epidemiologists have criticized the strategy because it would likely lead to widespread disease and death.
White House coronavirus advisor Dr.
Further complicating the herd immunity approach is the matter of how antibodies against the coronavirus behave. The body typically develops antibodies to help the immune system fight off infections. Health officials have said there is not enough data yet to indicate that coronavirus antibodies ensure immunity against the virus or to determine how long any protection might last.
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