From getting emotional to sharing their own experiences, people posted many reactions.
All passengers will be screened and monitored by the US Centers for Disease Control and Prevention.
There had been 89 new deaths from the virus - with 81 in Hubei province, and the rest in other regions.
The claim comes from a dubious website with a history of spreading false information.
He did so for the confusion and whatever anxiety that his announcement may have caused.
There has been a spike in reports of anti-Chinese rhetoric directed at people of Asian origin.
The UN agency has been sending testing kits, masks, gloves, respirators and gowns to every region.
Can you treat it? Can it spread from one person to another? All your questions are answered here.