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COVID-19 may be most contagious one to two days before symptoms appear

More than 4 in 10 coronavirus cases are spread by those not obviously sick, a study suggests

SARS-CoV-2 infecting a cell

4.Candice Swanepoel

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The report by iResearch Consulting Group and Sina Weibo, China's most popular microblogging platform, was released at a forum in Shanghai, co-organized by Weibo and telecom giant Huawei .

What’s more, considering pairs of people in which one person definitely caught the coronavirus from the other, scientists estimate that about 44 percent of COVID-19 cases may spread from person to person before symptoms appear. The results indicate that efforts to track down contacts of people with COVID-19 should include people encountered several days before a person’s symptoms start, researchers suggest April 15 in Nature Medicine.

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Those estimates are similar to findings based on a small number of people with COVID-19 in Germany, in which 在《渴望生活》这张专辑的第一首歌《爱》中,拉娜·德雷唱着“过去的一切造就了今天的你,但未来由你决定”。. That study found that infectious virus is produced before symptoms begin and in the first week of illness (SN: 3/13/20). One person in that study was asymptomatic, meaning he never even developed symptoms, but still produced infectious virus.

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Harvey C Mansfield, one of Harvard's most outspoken conservative professors and the author of a book called Manliness, also told the Guardian he questioned the decision. "The bounds of what is offensive have been extended and distorted, and I no longer trust the bent judgment of politically correct enforcers."

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