Table 2. Interventions in five severely affected countries.

Country	School closure	Ban gatherings	Lockdown
USA	March 20th, schools announced to be closed nationwide.	March 16th, numerous theater chains temporarily closed across the country, and most professional sports leagues announced the suspension of their events.	March 20th, the New York States, where has the worst pandemic situation, announced “lockdown”.
Italy	March 4th, the government announced to close all the schools across the country.	March 8th, gatherings were banned across the country.	March 9th, the government announced to extend the “lockdown” area across the country.
UK	March 18th, most schools across the country announced to be closed	March 23rd, Gatherings are banned across the country	March 23rd, the government announced “lockdown”, people were restricted from going out randomly.
The Republic of Korea	February 23rd, suspension for classes were implemented.	February 25th, Daegu and Gyeongbuk, where have the serious outbreak situation, lockdown.	February 27th, a wide range of gatherings were banned.
Spain	March 12th, schools across all the autonomous communities closed.	March 15th, gatherings were banned nationwide.	March 16th, the government announced “lockdown” nationwide.