"Epidemiologists lied about masks (or they really didn't know better 3-5 months into the pandemic, also not good)..."
Technically, if my timeline is right[1], about 2 months into the pandemic, for his example. 3-4 months generally. Plus they had a prior belief that masks wouldn't be useful.
[1] The world outside China learned about the thing at the end of December; his example is the first week of March.
Technically, if my timeline is right[1], about 2 months into the pandemic, for his example. 3-4 months generally. Plus they had a prior belief that masks wouldn't be useful.
[1] The world outside China learned about the thing at the end of December; his example is the first week of March.