New COVID Transmission synthesis from PHO.

Likes:
✅aerosol/droplet cut-off set at 100um
✅4 pages dedicated to synthesizing the growing aerosol/airborne/AGMP literature
✅acknowledgement of airborne transmission in poorly ventilated settings

https://www.publichealthontario.ca/-/media/documents/ncov/covid-wwksf/2020/12/routes-transmission-covid-19.pdf?la=en

1/4
Dislikes:
❌No mention of short-range aerosol transmission
❌Ongoing false assumption that close contact transmission = droplet transmission
❌Commenting on R0 with no mention of K/dispersion

2/4
Relevant facts:
✅Average human hair is 60-100um diameter
✅Droplets > 100um behave like small wet cannonballs, landing on your face or in your eye/mouth
✅96%, 99% & 94% of particles emitted while coughing, sneezing & speaking are aerosols (<100um) (Duguid JP 1946)

3/4
@PublicHealthON working theory?

People catch COVID from large virus-filled saliva cannonballs landing on their face while somehow avoiding inhaling the >94% of aerosolizing particles emitted by the infected person 🤔

4/4

@DFisman @jljcolorado @linseymarr @rye_b @MackayIM
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