"Disaster in motion: 3.4 million travelers poured into US as coronavirus pandemic erupted - Travel data of passengers arriving in the United States from China during the critical period in December, January and February, when the disease took hold in that country, shows a stunning 759,493 people entered the U.S..."
https://abcnews.go.com/Politics/disaster-motion-34-million-travelers-poured-us-coronavirus/story?id=69933625