A Coronavirus Vaccine Is Coming. Just Don’t Call It ‘Warp Speed.’ – The New York Times

How many people need to be protected by a vaccine before its recommended for widespread use? Ideally, rates of disease will be 70 percent lower in vaccinated people than in unvaccinated people. The World Health Organization says a vaccine should be at minimum 50 percent effective, averaged across age groups. (We know from influenza that vaccines dont always work as well on older adults whose immune systems have declined.)
This benchmark is crucial because a weak vaccine might be worse than no v…

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