NIH in 2013: Cloth masks ineffective
https://pubmed.ncbi.nlm.nih.gov/24229526/
NIH in 2020: Cloth masks work!
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7253999/
WHO in 2020: COVID is not transmissible in humans
WH in 2020: Run away!!!!
CDC in 2020: Keep 6 feet away!!!
CDC in 2021: 3 feet is good enough.
CDC in 2020: Must close the schools!
CDC in 2021: Schools should never have been closed.
CDC in 2020: 15 days to straighten the curve
CDC in 2021: Maybe next year...
CDC in 2020: no way US has a vaccine before end of CY
CDC in 2020: We have a vaccine!
Fauci in 2020: herd immunity = 60% to 70%.
Fauci in 2020: herd immunity = 70% to 75%
Fauci in 2021: herd immunity = 85%