LISTEN as highly influential Prof John Conly (upper left) of UCalgary, AHS CV19 sci advisory grp, Public Health Agency Canada, Chair WHO Infection Prevention & Control R&D Expert Grp. opposes N95 wearing citing acne harm vs @DFisman & @kprather88 precautionary principle. /1

"there's been decreased O2 concentrations in pregnant women" yeah, well here's the reference from one of his publications, dissected in fine form by @caruzycki /2 https://twitter.com/caruzycki/status/1380711275307540481?s=20

Here's an example of Prof Conly's influence by the dedicated @jmcrookston /3 https://twitter.com/jmcrookston/status/1316441457675431936?s=20

What would a dermatologist prefer, acne or COVID-19? Let's find out! /4 https://twitter.com/lisa_iannattone/status/1380596564910047240?s=20

Because of Prof. Conly's influence, public health agencies around the world continue to double down on contact and droplet. Public Health Ontario: /5

February 19, 2021 Directive 5 FAQ from Ontario Ministry of Health & LTC:

Droplet & Contact precautions, and conserve PPE.

Conserve PPE, despite ample supplies. One year into the pandemic. It's egregious. /6

Here's what the CDC and NIOSH have to say about the differences between Surgical Masks and N95 Respirators. /7
(image adapted from https://www.cdc.gov/niosh/npptl/pdfs/UnderstandDifferenceInfographic-508.pdf)

The presentations by Prather and Fisman make an excellent summary of how the wide variance in respiratory aerosols produced by people can explain the high dispersion factor of COVID-19. Highly recommended to view the 60 minute session in its entirety /8 https://ucalgary.yuja.com/V/Video?v=332352&node=1205653&a=385475807&autoplay=1