I’m an epidemiologist. When I heard about Britain’s ‘herd immunity’ coronavirus plan, I thought it was satire
William Hanage
We talk about vaccines generating herd immunity, so why is this different? Because this is not a vaccine. This is an actual pandemic that will make a very large number of people sick, and some of them will die. Even though the mortality rate is likely quite low, a small fraction of a very large number is still a large number. And the mortality rate will climb when the NHS is overwhelmed. This would be expected to happen, even if we make the generous assumption that the government were entirely successful in restricting the virus to the low-risk population, at the peak of the outbreak the numbers requiring critical care would be greater than the number of beds available. This is made worse by the fact that people who are badly ill tend to remain so for a long time, which increases the burden.
And of course you can’t restrict it to this age group. Think of all the people aged between 20 and 40 who work in healthcare, or old people’s homes. You don’t need many introductions into settings like these for what we might coyly call “severe outcomes”. In Washington State, nearly all the deaths reported so far have been associated with nursing homes. Is everyone in a high-risk group supposed to withdraw themselves from society for six months until they can emerge once the (so far entirely imaginary) second wave has been averted?
About that second wave: let me be clear. Second waves are real things, and we have seen them in flu pandemics. This is not a flu pandemic. Flu rules do not apply. There might well be a second wave, I honestly don’t know. But vulnerable people should not be exposed to a virus right now in the service of a hypothetical future.
