alarming report from Germany in this week's New England J of Medicine confirming transmission of infection early in its asymptomatic incubation period. Patient "1"(who had been infected by a then-asymptomatic index patient who had traveled to Germany from China) then infected another work colleague with whom he had contacts only the same day or the day after patient 1 himself became infected--and 3 or 4 days before patient 1 became symptomatic. If such early transmission soon after infection is common, it will spread quickly and widely. All the patients in this cluster had short, mild cases.
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