That was my point. We do not what we know until we know it, and can not act on a problem while unaware of it. We did not know Corona virus was in the U.S. until late February. Anything we found out about its presence before February came later.
You’re still wrong. First listed case was 1/21/2020.
https://abcnews.go.com/Health/timeline-coronavirus-started/story?id=69435165