Details that have emerged about the new virus from China reveal how challenging it may be to control the outbreak.
This illustration provided by the Centers for Disease Control and Prevention in January 2020 shows the 2019 Novel Coronavirus . This virus was identified as the cause of an outbreak of respiratory illness first detected in Wuhan, China.
"The level of concern has been growing" with the new revelations about viral spread, said Marc Lipsitch of Harvard's School of Public Health. Based on the first 425 confirmed cases in China, each infection led to 2.2 others on average, Chinese scientists reported last week in the New England Journal of Medicine. That’s a bit more than ordinary flu but less than SARS, a genetic cousin of the new virus.
This so-called asymptomatic transmission"puts a terrible burden on the screening process," which has heavily relied on symptoms to detect cases and track close contacts to limit spread, Fauci said.
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