25 scientists were sent to China to research the coronavirus. Here's what they found.
As of late February, the median age of the coronavirus cases in China was 51. The majority, around 77%, of cases were in people between 30 and 69 years old. Bats appear to be the source of the coronavirus, but it's not yet clear which type, or types, of animals were the "intermediate hosts" that passed the virus on to humans. COVID-19 is transmitted via "close unprotected contact.
COVID-19 is a "newly identified pathogen" and there is "no known pre-existing immunity in humans," the report said. "Everyone is assumed to be susceptible, although there may be risk factors increasing susceptibility to infection." For people under 18 years old, "there is a relatively low attack rate." The report found that there were no positive cases of coronavirus in children in November, December, or the first two weeks of January.
People interviewed for the report "could not recall" instances where a child transmitted the virus to an adult. COVID-19 symptoms can range from no symptoms to "severe pneumonia and death." Mild respiratory problems and fever start on average five to six days after infection. The typical signs based on over 55,000 cases were:
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