If you go back to January, what was the most effective policy?

Well, China (if you believe them) was the most effective: A TOTAL TRAVEL BAN FROM HUBEI. They literally locked down 60m people.

Sanjay Gupta...opposed such travel bans in February. https://t.co/91Zuwco96F

— Pradheep J. Shanker (@Neoavatara) September 18, 2020