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该模型数据显示，冠状病毒可能在2月份在美国广泛传播，并且仅从其他国家/地区进口了几例进口病例，便在国内迅速传播。
波士顿东北大学（Northeastern University）团队领导的研究人员报道，虽然从中国和其他国家的直接进口可能是导致Covid-19早日引入美国的原因，但传播最多的是州与州。
“我们估计到2020年2月SARS-CoV-2将会在社区广泛传播，”由东北大学生物与社会技术系统建模实验室领导的小组在预印服务器MedRxiv上写道。他们的工作尚未经过同行评审。
他们写道：“我们的结果表明，许多州是从国内而不是国际上获得种子的。” “对于大多数大陆国家来说，进口感染的最大贡献来自国内旅行。”
美国于1月31日宣布对从中国出行的限制。研究人员说，他们的模型研究表明，这种限制来得太迟了。
他们写道：“来自中国大陆的进口可能与1月份的流行有关，但由于2020年1月23日以后往返中国大陆的旅行限制，因此在美国COVID-19扩张中起着很小的作用。” 。
他们补充说：“内布拉斯加州引进的病毒占国内来源的85％，新墨西哥州占86％，阿肯色州占86％，北达科他州占95％。”
研究人员写道，该模型带有几项研究的证据，这些证据表明，到1月31日宣布出行限制时，美国已经存在大量感染。
1 hr 40 min ago
Coronavirus may have arrived in the US from China, but most of the spread was domestic, model suggests
From CNN’s Naomi Thomas
Coronavirus was probably spreading widely across the US in February, new modeling data suggests, and it only took a few imported cases from other countries to set off rapid spread inside the borders.
While direct imports from China and other countries may have been responsible for the early introduction of Covid-19 to the US, most spread was state to state, researchers led by a team at Northeastern University in Boston reported.
“We estimate widespread community transmission of SARS-CoV-2 in February, 2020,” a team led by Northeastern’s Laboratory for the Modeling of Biological and Socio-technical Systems wrote on MedRxiv, a pre-print server. Their work has not been peer-reviewed.
“Importations from mainland China may be relevant in seeding the epidemic in January, but then play a small role in the COVID-19 expansion in the US because of the travel restrictions imposed to/from mainland China after January 23, 2020,” they wrote.
波士顿东北大学（Northeastern University）团队领导的研究人员报道，虽然从中国和其他国家的直接进口可能是导致Covid-19早日引入美国的原因，但传播最多的是州与州。
“我们估计到2020年2月SARS-CoV-2将会在社区广泛传播，”由东北大学生物与社会技术系统建模实验室领导的小组在预印服务器MedRxiv上写道。他们的工作尚未经过同行评审。
他们写道：“我们的结果表明，许多州是从国内而不是国际上获得种子的。” “对于大多数大陆国家来说，进口感染的最大贡献来自国内旅行。”
美国于1月31日宣布对从中国出行的限制。研究人员说，他们的模型研究表明，这种限制来得太迟了。
他们写道：“来自中国大陆的进口可能与1月份的流行有关，但由于2020年1月23日以后往返中国大陆的旅行限制，因此在美国COVID-19扩张中起着很小的作用。” 。
他们补充说：“内布拉斯加州引进的病毒占国内来源的85％，新墨西哥州占86％，阿肯色州占86％，北达科他州占95％。”
研究人员写道，该模型带有几项研究的证据，这些证据表明，到1月31日宣布出行限制时，美国已经存在大量感染。
1 hr 40 min ago
Coronavirus may have arrived in the US from China, but most of the spread was domestic, model suggests
From CNN’s Naomi Thomas
Coronavirus was probably spreading widely across the US in February, new modeling data suggests, and it only took a few imported cases from other countries to set off rapid spread inside the borders.
While direct imports from China and other countries may have been responsible for the early introduction of Covid-19 to the US, most spread was state to state, researchers led by a team at Northeastern University in Boston reported.
“We estimate widespread community transmission of SARS-CoV-2 in February, 2020,” a team led by Northeastern’s Laboratory for the Modeling of Biological and Socio-technical Systems wrote on MedRxiv, a pre-print server. Their work has not been peer-reviewed.
The US announced restrictions on travel from China on Jan. 31. The researchers say their modeling study suggests the restrictions came far too late.
“Importations from mainland China may be relevant in seeding the epidemic in January, but then play a small role in the COVID-19 expansion in the US because of the travel restrictions imposed to/from mainland China after January 23, 2020,” they wrote.
The model jibes with evidence from several studies that suggest there were already a significant number of infections in the US by the time the travel restrictions were announced on January 31, the researchers wrote.
