The CDC's own learnings from SARS-COV1 concluded 'probable airborne spread' and the low efficacy of hand washing as an intervention, but somehow SARS-COV2 was totally different.

https://wwwnc.cdc.gov/eid/article/19/6/13-0192_article

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2190272/

https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5212a1.htm