[Ed. – You have to mine the depths of experts’ statements on these things, as Margolis did at PJM, to pull them out. The mainstream media won’t acknowledge them.]
New York Times science reporter Donald G. McNeil Jr. noted that the Trump administration took “aggressive measures like barring entry to non-Americans who were recently in China and advising Americans not to go to China or South Korea,” and that this strategy worked, despite the fact that the World Health Organization officially opposes travel and trade restrictions, and “reiterated that even as it declared the epidemic a global emergency on Jan. 30.”
The W.H.O.’s epidemic-modeling teams concluded that travel restrictions had slowed the spread of the virus outside China by two to three weeks.
For the United States, the delay was probably far greater. Air-traffic data shows that flights from China to the United States dropped much more than they did to Europe.