Justin Lessler is an associate professor of epidemiology at the Johns Hopkins University Bloomberg School of Public Health.One study, by epidemiologist Lessler and colleagues at Johns Hopkins Bloomberg School of Public Health, found that 97.5% of those who develop symptoms do so within 11.5 days, according to a paper published in the Annals of Internal Medicine.
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“There’s a trade-off because you might miss some people, but you could get so many more people to adhere to the quarantine requirements that the gains would far outweigh the people you might miss,” said Mark Plescia, chief medical officer for the Association of State and Territorial Health Officials, which represents state health departments in the U.S. In Germany, public-health officials have said the quarantine period can be reduced to 10 days from 14 starting Nov. 8, though it is up to individual states to decide if they want to follow that recommendation.