Far more Americans are infected with the coronavirus than the U.S.'s limited testing has shown so far.

Immediate steps are needed in areas with few confirmed cases to stem the tide of illness and death in the coming months, a new model suggests. https://nyti.ms/2U51M6d 
Researchers from Columbia University found that even the extraordinary restrictions put in place this week will probably not be enough to prevent significantly more infections in areas such as New York City, Seattle, Boston and parts of California https://nyti.ms/2UoXwgL 
But parts of the U.S. without large clusters of cases could avoid the worst of the outbreak, estimates say — if controls are put in place immediately and everywhere.

Even if the rate of transmission is cut in half, some 650,000 people could be infected in the next 2 months.
Without control measures, the outbreak might sweep across most of the U.S. by early May. Here's how. https://nyti.ms/2UoXwgL 
And this is how the coronavirus outbreak might spread with some control measures in place.

California, Florida and the Northeast would face severe outbreaks that peak in the summer. https://nyti.ms/2UoXwgL 
With severe control measures, however, the coronavirus outbreak could be limited in areas that do not now have large numbers of known cases, according to the estimates https://nyti.ms/2UoXwgL 
See more about the estimates and the researchers' warnings — and how the rate of coronavirus infections could vary by state depending on how and when control measures are put in place https://nyti.ms/2UoXwgL 
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