The repatriation of 565 Japanese citizens from Wuhan, China, in late January offered scientists an unexpected opportunity to learn a bit more about the novel coronavirus (2019-nCoV) raging in that city. To avoid domestic spread of the virus, Japanese officials screened every passenger for disease symptoms and tested them for the virus after they landed. Eight tested positive, but four of those had no symptoms at all, says epidemiologist Hiroshi Nishiura of Hokkaido University, Sapporo—which is a bright red flag for epidemiologists who are trying to figure out what the fast-moving epidemic has in store for humanity. If many infections go unnoticed, as the Japanese finding suggests, that vastly complicates efforts to contain the outbreak.
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