World Hidden Outbreaks Spread Through U.S. Cities Far Earlier Than Americans Knew, Estimates Say April 23, 2020April 23, 2020Benedict Carey and James GlanzComments Off on Hidden Outbreaks Spread Through U.S. Cities Far Earlier Than Americans Knew, Estimates Say New York, Boston, San Francisco, Chicago and Seattle had undetected outbreaks long before testing showed a major problem, according to a model.
