“If the cruise ship epidemic is a microcosm of the community outbreak scenario,” Yuen and his colleagues concluded in their published report, “then individuals with or without pneumonia could carry the virus for a long period but remain asymptomatic.” And they could do more than carry it; they could spread it. To me he said, “That is very important. That is why you cannot control a pandemic”—could not control this pandemic, anyway—“because there’s so much asymptomatic cases spreading infection around.” Think of it, he said: we found nine positives from the Diamond Princess, six of them
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