(CNN)The novel coronavirus silently spread in the United States earlier than previously thought, infecting tens of thousands of people in New York and other major cities, researchers say.
A new model by the Network Science Institute at Northeastern University in Boston shows the first infections came from China in early or mid-January, and that the virus went undetected because many people were not presenting symptoms.
“The disease spread under the radar,” Alessandro Vespignani, director of the Network Science Institute, said on “CNN Newsroom” on Thursday.
The model suggests that while Americans were still focused on China, about 28,000 people in major cities — such as New York, San Francisco and Seattle — were infected by March 1.
继续阅读Coronavirus spread ‘under the radar’ in US major cities since January, researchers say