David Osborn Profile picture
Health and Safety Consultant Exec Team member, CATA Views expressed are my own.
Jan 10 10 tweets 3 min read
SURGICAL MASKS DO NOT PROTECT

So encouraging to see the sheer strength of feeling amongst so many highly-respected scientists & medical practitioners from across the world making representations to WHO

This letter from World Health Network is a must-read
tinyurl.com/WHN-Letter-to-… It is now over 3 years since the WHO Chief Scientists admitted that their failure to acknowledge the airborne route of transmission of COVID-19 was a big mistake.
Dec 15, 2025 7 tweets 3 min read
Just like we could usefully have done without a resurgence of flu, we could usefully have done without a resurgence of Professors Heneghan and Dingwall.

Let's consider these 2 commentators objectively, one at a time...

1/7 Heneghan’s credibility was & remains irreparably tarnished by misleading the Covid-19 Inquiry.

He understated the role of airborne transmission, promoting fomites & large droplets in his signed "statement of truth" (as pointed out, a s.35 offence).



2/7 legislation.gov.uk/ukpga/2005/12/…Image
Aug 29, 2025 9 tweets 3 min read
This is a ‘must see’ video for anyone interested in airborne transmission of disease.

Aerosol Scientist Dr Al Haddrell (Bristol University) has a gift for being able to communicate scientific concepts in such a straightforward and comprehensible way.

During the pandemic, so much ground-breaking research has been done by Bristol scientists such as:
-AERATOR study (showing that some ‘AGPs’ generate less aerosol than a cough);
-CELEBS study on infectivity-decay with time;
-Aerosols generated by singing;
-School transmission etc.
Aug 22, 2025 13 tweets 3 min read
🚨🩺😷🚨🩺😷
BREAKING!

At last!

In the UK, we have official guidance on the use of respirators (FFP3) vs Fluid Resistant Surgical Masks (FRSM) which has been prepared SPECIFICALLY FOR THE HEALTHCARE SECTOR.

🚨🩺😷🚨🩺😷 This has been prepared by BOHS, acknowledged experts in all matters relating to PPE and health risks at work (including microbiological risks). Image
Mar 29, 2025 11 tweets 3 min read
💥 💥💥💥💥💥
CATA has written to the Minister, respectfully advising her that, as per her predecessor (Gwynne), she’s been badly advised.

One can only speculate whether by DHSC, UK-HSA or the NHS/IPC “droplet, not airborne” dogmatists.
tridenthse.co.uk/2025_03_18_Let…
💥💥💥💥💥💥
1/11 x.com/annesmithmcc/s… CATA confirms to the Minister that health & safety LEGISLATION has supremacy over GUIDANCE in the National IPC Manuals.

These manuals do NOT comply with H&S legislation (COSHH/PPE).

Now that the Minister is aware of this, she needs to act (or "knowingly permit” offences).

2/11
Feb 7, 2025 8 tweets 3 min read
⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️

COVID-19 Inquiry refuses to
make healthcare employers
comply with the law

⚖️ ⚖️ ⚖️ ⚖️ ⚖️ ⚖️ ⚖️ COSHH Regulation 7 mandates unequivocally that “HSE-approved” Respiratory Protective Equipment must be provided where other risk controls are not effective. Image
Feb 5, 2025 9 tweets 3 min read
🚨🚨🚨🚨🚨
COVID INQUIRY
DECLINES TO RULE
THAT COVID IS AIRBORNE

covid19.public-inquiry.uk/wp-content/upl… 🚨🚨🚨🚨🚨

COVID INQUIRY UNABLE TO RULE THAT FFP3 RESPIRATORS PROTECT BETTER THAN SURGICAL MASKS! Image
Dec 14, 2024 6 tweets 2 min read
IOSH Article: "Nurses with Long Covid being let down by employers".

Indebted to Dr Alison Twycross @alitwy, Chair of RCN Long COVID Working Group & her colleagues for producing this thorough and detailed survey, though saddening and moving.



#1 of 6tinyurl.com/3fretxh7 @alitwy This is the immeasurable human cost in terms of suffering and misery arising from highly flawed IPC guidance running rampant throughout the NHS, mandating surgical masks as "protection" against an airborne, highly pathogenic virus.

#2 of 6
Apr 26, 2023 4 tweets 2 min read
* HEALTHCARE WORKERS WITH LONG COVID *

Does your employer deny your disease was 'occupational exposure'? Refused to report under RIDDOR?

A Safety Practitioner's view on how RIDDOR should have been applied to Covid-19 infections of HCWs.

NB Important - See notes in next tweet Image The Flow Diagram in the previous tweet should be read in conjunction with these accompanying notes which give further details, explain its limitations and explain the rationale behind it.
You can download the flow diagram + notes as a single PDF file.
tridenthse.co.uk/riddor/Flow_Di… Image
Apr 9, 2023 13 tweets 9 min read
@kallmemeg @BylineTimes As one of the researchers in the BLT article, I assure you there is nothing ‘fake’ about this article.

Therefore please address your comments to me, not BLT.

My response to your dismissive tweet:
1) RIDDOR was NOT revoked and has REMAINED IN FORCE throughout the pandemic.

#1 @kallmemeg @BylineTimes 2) HSE guidance throughout the pandemic has been that deaths arising from occupational exposure to Covid-19 MUST be reported to them.

3) NHS-Employers guidance also required deaths to be reported to HSE under RIDDOR (over and above CPNS).

#2
Jan 25, 2023 13 tweets 13 min read
Problems looming on the pandemic front? Not COVID-19 - A new one…!

With avian flu (H5N1) in the country, most people were concerned as to whether they would get their Christmas turkey or when the supply of eggs would get back to normal in the shops. However, with the virus around us in such quantities the concern to epidemiologists has always been whether a human-to-human mutation would occur. It seems that it has. We may yet have to hunker down!
Dec 23, 2022 4 tweets 11 min read
'Long Covid Doctors for Action’, along with the BMA are running a survey to assess the impact of Long Covid. Although the survey is for doctors, the outcome should be beneficial to ALL healthcare professions. See this link for details. PLS CIRCULATE WIDELY
tridenthse.co.uk/survey.html NB. This is housed on my website simply due to the fact that, at Friday evening, 23rd December the chances of finding any webmasters still at work are pretty remote! And the survey deadline is 6 Jan.

I confirm that I have no commercial or financial interest in this matter.