Any of the studies including times when infection could occur when there was no mask worn aren't mask studies: they're studies on the infection risks of the behaviors/locations of the non-masking period. Mask efficacy is tested like parachute efficacy is tested: how they work when they're deployed.

See condoms. All the folks who claim they use them and wonder WHY they got pregnant. Then they finally confess: Well, we don't use them ALL the time... Masks work. Condoms work.

Thank you for care, integrity and all-round brilliance Trisha! This is such a complex topic, with so many vested interests in supporting one side or another, it is great to have clarity - as well as a worked-through example for methodological guidance on other topics.

We found many review teams made the dataset “manageable” by excluding observational studies—often with little/no justification—despite observational studies dominating this topic. 3/

We will never forget them. ❤️ #MemorialMonday

For anyone who can't figure out why so many infection control docs are still desperately trying to manufacture a narrative that COVID isn't airborne, N95s don't work, and nothing could have been done differently in 2020... ...imagine having to face the guilt for this in the mirror every day.

The large majority of COVID deaths are attributable to specific clear instances of negligence on the part of medical leaders, made directly against the advice of the world's top scientific experts, and on the basis of an understanding of science that was out of date by nearly a century.

The author list on this 2010 paper, showing dramatically greater protection against SARS from N95s compared to surgical masks, is also in the "good to know" category. Clearly shows that SARS-CoV-1 transmitted in aerosols (and NB these aren't all necessarily intubation-specific events).

Really fun and special day at the wall - and it's always wonderful to see @nickymorgan.bsky.social ...

I hope that the former members of the "IPC Cell" and those who oversaw their secretive activities during the height of the pandemic are taking careful notice. Ditto: Their supporters and current proponents of the big lie that surgical masks protect against an airborne disease.

This letter, signed by so many experts and representatives of millions of healthcare workers around the world (including Dr Barry Jones, Chair of CATA, {Covid Airborne Transmission Alliance}) must surely persuade WHO to come clean and change policy.

Sickness, Disability, and Death in NHS England Staff The three graphs that *every person* needs to see. The question that every single person needs to ask their government: What are you doing to protect me from Covid infection?

Covid is airborne but the guidance in our NHS is still to wash hands for a predominantly airborne virus.

On medical chauvinism. @mark-ungrin.bsky.social canadahealthwatch.ca/2025/04/18/t...

Influenza A (specifically including H3N2) is a Risk Group 3 bioaerosol hazard. Check out the data sheet and then plug that into the CSA standard below to see what level of protection a Canadian employer should be providing if it *may* be present in your workplace.

🚨 The Minister for Children and Families, Josh MacAlister MP, has formally acknowledged that Covid is airborne in a new letter dated 30 Oct 2025. 👉 Read the full letter: shh-uk.org/minister-... #SafeAir4All #CleanAir #Schools #Health #UKPolitics #loncovid #longcovidrecovery

This is quite the letter to Baroness Hallett by @barryjmjones.bsky.social of CATA (thanks to @alanbarnard1.bsky.social and @safedavid3.bsky.social for the heads up). That last sentence in the NHS strategy statement especially caught my eye.

I'm overwhelmed by the public support for a CSA National Standard in 🇨🇦 for precautionary universal N95 use in healthcare From all over the world Like this comment from @safedavid3.bsky.social

Exercise Pegasus - The UK Prepares for Pandemic simulation. I wonder whether key stakeholders will be invited to join as participants or observers? By "key stakeholders” I mean those who will die or be seriously harmed when Gov UK gets it wrong (again!)

Ever wondered how virus laden aerosols (“virosols”) form and spread? 🌬️ The Aerosol Research Centre in Taiwan has a clear, illustrated guide showing how airborne transmission works and what simple steps actually help. 🔗 shh-uk.org/understan... #CleanAir #Virosols #longcovid

CATA has written an open letter to Baroness Hallett archive.org/details/2025...

Here's an interesting development - a letter of quiet outrage from CATA to Baroness Hallett, Chair of the Covid-19 Inquiry, pointing out that @nhsengland.bsky.social are effectively sticking two fingers up to her! Excerpt from letter in the pic, link to letter in @safedavid3.bsky.social tweet below.

Some links: youtu.be/2cpRZ-ZoOVA Dr Jones - Oral Evidence to Inquiry tinyurl.com/yrn5sr4d Witness Statement Module 1 tinyurl.com/4bw6jj6n Witness Statement Module 3 tinyurl.com/4dx6yd24 Closing submissions tinyurl.com/439h4zyw Misc blogs/interviews tinyurl.com/4km62f5t Recent press release

A year ago today we welcomed members of CATA (Covid Airborne Transmission Alliance) including @kamgadhok.bsky.social @barryjmjones.bsky.social and @safedavid3.bsky.social to the wall. They continue to highlight the UK failure to protect healthcare workers from life-changing respiratory diseases.❤️

What Martin said. Independent SAGE were not cranks, not extremists, not over-reacting. #covidinquiry

Yesterday, after our meeting with DCMS about the wall's permanence, we had the sad task of updating the number of covid dead. ❤️

The Inquiry has now concluded that our 🇬🇧government response was catastrophic. No politician has accepted responsibility (I doubt they ever will). The Inquiry should have STARTED with the fact that the response was catastrophic …. the data is all there. #ToryCovidCatastrophe #MemeForToday

We've been meeting regularly with the DCMS, but today's felt special: the first meeting since the announcement in Parliament that the wall will be made permanent. ❤️

"Lady Hallett Shouldn’t Hold Her Breath, says Health Campaign Group" In the wake of the Covid Inquiry's Module 2 report, an interesting article quoting members of CATA (Covid Airborne Transmission Alliance), including @barryjmjones.bsky.social @safedavid3.bsky.social and @kamgadhok.bsky.social

8/ Obviously it's easy to be wise after the event, but everything we said at the time is on our web site for others to judge independentsage.org

Thank you.

The view of the Wall at the reception we attended at the House of Lords, after the Government announcement that the Wall should be preserved. We look forward to this exciting next chapter. ❤️

#PublicHealth measures like ventilation and air filtration are a matter of urgency "Chances that disease X will be an influenza virus are probably greater than for any other known pathogen group" time.com/7324877/flu-...

Professor @cathnoakes.bsky.social gave evidence to the UK Covid Inquiry on transmission in schools and the importance of ventilation to control both infections and air pollution exposure. Read transcript and witness statement on the Covid Inquiry website: covid19.public-inquiry.uk/hearings/chi...

Great news all round. Let’s hope this sparks action across the rest of the country 🤞🏽

It didn’t end well.

I want every single child to breathe clean air in and around their school. This new £2.7 million City Hall initiative will provide indoor air quality filters to at least 200 schools across all London boroughs, benefitting tens of thousands of children.

🩵🩶 #NHS #CovidIsNotOver #COVIDisAirborne #N95sSaveLives #CleanAirNow #LongCovid #LongCovidKids #WeNotMe #TogetherWeCan #ShareTheCare

Our latest blog went live earlier this week. In it @EvonneTCurran discusses how while handwashing shouldn't be ignored it's not the most important preventative measure for airborne infections. shh-uk.org/hand-hygi...

#COVID causes vascular damage. Here is Dr Rae Duncan talking about the risks. www.youtube.com/watch?v=ydRl...

🧵

Thank you, Barry. It is disheartening - but not demotivating. This memorial to our beloved dead is too important. ♥️

Shame on them. 💔

Good to see this BOHS guidance explaining the difference between FRSM and FFP3 in healthcare. FRSM are useful but are not protective equipment for workers and it’s important this is recognised properly when determining protection against airborne infection www.bohs.org/media-resour...

🚨😷🚨😷🚨😷🚨😷 BREAKING NEWS At last, in the UK, we now have official guidance on the use of respirators (FFP3) vs Fluid Resistant Surgical Masks (FRSM) which has been prepared SPECIFICALLY FOR THE HEALTHCARE SECTOR. 🚨😷🚨😷🚨😷🚨😷

Size Matters!??? This topic exposes how the IPC authors are still wedded to principle of aerosols being ‘respirable’ i.e. 5 microns or less, despite the expert evidence at the Covid-19 Inquiry. Getting this wrong means that Healthcare Workers are given inadequate respiratory protection.

Other topics are covered in the presentation: • Engagement with Government • CATA engagement with International colleagues • The draft new Canadian Standard for RPE • Size Matters!

More information can be obtained by viewing a 20 minute presentation given to the Safer Healthcare Biosafety Network on the Patient Safety Learning website. (The presentation can be downloaded as a pdf) www.pslhub.org/learn/invest...

The legal aspects are clearly explained: