TL;DR The Tome of Nuance

IMHO this review muddies the messages and flip flops on key mitigation strategies
When the science and our understanding evolves, it’s important to communicate this clearly and concisely to the public rather than fall back on nuance and shades of gray. Even when this means admitting that previous messaging was incorrect.
Side tweet - Probably could have saved some pages by omitting the giant shades of gray diagram - not a difficult concept
We thought SARS-CoV-2 spread primarily through droplet spray at “close contact”. We were wrong. Close range aerosol inhalation is a key mode that was overlooked. Depending on environmental factors (ie indoors, 3C’s), long range inhalation also not uncommon. #COVIDisAirborne
We know that airborne pathogens spread most commonly at close range, where aerosols are most concentrated. The public knows TB is airborne. This doesn’t lead to panic. It leads to airborne mitigation measures like avoiding 3Cs and wearing respirators when in high risk settings
We thought asymptomatic transmission wouldn’t happen. We were wrong. Asymptomatic spread can and does happen.
We thought universal masking wouldn’t help and may hurt. We were wrong. Masks help through source control and through filtering inhaled aerosols for personal protection. True respiratory PPE should optimize fit, filtration & function (ie respirators - N95s/elastomerics)

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More from @JenniferKShea

15 Apr
“During the great COVID pandemic of 2020, you may be shocked to learn that many international ID experts believed that respiratory viruses spread primarily through fomites and eyes, rather than the more obvious route - inhalation...”
“As the pandemic swept across the globe, and cases grew, so did the evidence supporting aerosol transmission. The increased risk in shared indoor air and poorly ventilated spaces and decreased risk outdoors was plain for all to see.”
“The paradigm shift was accepted swiftly by some. Others held firm. Some even postulated that the decreased risk outdoors was related to a mysterious germicidal substance in outdoor air, rather than the obvious answer- dilution.”
Read 4 tweets
25 Mar
Review of available evidence supporting fomites transmission

TLDR: there is no evidence

f1000research.com/articles/10-233
Current IPAC policies are heavily weighted towards preventing droplet/fomites spread and active nosocomial outbreaks are blamed on HCWs for not tying gowns correctly, other donning/doffing errors, not wearing proper face shield, etc
Number of studies that have successfully cultured Covid from used hospital gowns/gloves/HCW hands/face shields? 0️⃣

Number that have found SARS-CoV-2 RNA on these items? 0️⃣

Only positive RNA sample on “PPE” was 1 sample on the front of 1 shoe...
Read 4 tweets
22 Mar
It's widely accepted that #MeaslesIsAirborne

I summarized the evidence for airborne spread of Measles vs. COVID-19 in a table

The results were quite shocking to me ...

How is it that we are still discussing whether or not #COVIDisAirborne??

1/
The disease on the left is managed with airborne precautions, including respiratory protection (N95/respirator) and ventilation optimization

2/
In Canada, the disease on the right is still managed with droplet and contact precautions (gowns, gaping surgical masks with substandard filtration efficiencies, gloves, face shields and plenty of hygiene theatre)

3/
Read 18 tweets

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