theatlantic | Other researchers with whom I spoke echoed many of the same concerns
about people’s possible resistance to taking a vaccine, especially if
its rollout is botched. To avoid such mistakes, Michele Andrasik and
Chris Beyrer, who are among the leaders of the COVID-19 Prevention
Network, an initiative by the National Institutes of Health, have
already started to test different messages for communicating the
benefits of immunization to the public. As Beyrer told me, early results
indicate that an emphasis on the importance of the vaccine for
revitalizing local communities will be crucial. “A lot of people are
feeling very isolated,” he said, “so we are building a lot around
solidarity: ‘We are all in this together!’”
Because of the
influence of the anti-vaxxer movement, the vaccination rate for measles
has dropped so low in certain areas of the country that children from
Brooklyn to Santa Monica have contracted the potentially
life-threatening disease. It is natural to fear that the same could
happen with the coronavirus. But this ignores the fundamental
differences between the two diseases. “You can’t just take the
anti-vaxxer mentality you see with measles,” Flier told me, “and apply
it to the situation we face with COVID.”
But will enough people get it? What happens if, as the CBS poll suggests, one in five Americans refuses to cooperate?
According to the experts I spoke with, the threshold for herd
immunity for COVID-19 is likely to fall somewhere between 50 and 70
percent of the population. Since about one in 20 Americans is likely to
have suffered from COVID-19 by the time a vaccine becomes available,
this means that somewhere between 45 and 65 percent of the American
population will need to be vaccinated.
In the case of measles,
herd immunity requires an almost total social consensus about the
utility of vaccines. As some children have painfully learned, such near
unanimity is difficult to sustain. But in the case of COVID-19,
anti-vaxxers would have to convert a much larger proportion of Americans
in order to have a similarly devastating impact on our collective
health. Unless one in three—or even one in two—Americans refuses a
vaccine that would allow them to go back out into the world without fear
and protect their loved ones from a deadly pandemic, the U.S. is likely
to reach herd immunity.
Again and again,
the coronavirus has defied expectations about how it is likely to
behave. We would therefore be well advised to reckon with the
possibility that things could once again break against us. Perhaps this
virus is not only uniquely suited to disrupting human civilization but
also unexpectedly adept at beating our attempts to immunize people
against it.
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