Trish Greenhalgh
@trishgreenhalgh.bsky.social
DEI hire. Prof of Primary Care, Uni of Oxford. Researching digital health/ inequities, covid prevention (masks/ air quality). Wild swimmer. Mum to Rob (marine bio) & Al (doc). She/her. https://scholar.google.com.au/citations?user=QDCqsJwAAAAJ&hl=en&oi=ao
Pinned
Our new paper:
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy | Research Synthesis Methods | Cambridge Core
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
www.cambridge.org
Short thread on our new paper. We use face mask efficacy research as a “stress test” for systematic review methods. We analysed 66 systematic reviews of face mask efficacy; they reached widely different conclusions (~half said they work, half said that evidence of efficacy was lacking). 1/
Robotic vacuum cleaners:
Yes or no?
High-end or budget?
Must-haves / nice-to-haves?
Red flags?
Yes or no?
High-end or budget?
Must-haves / nice-to-haves?
Red flags?
February 16, 2026 at 2:41 AM
Robotic vacuum cleaners:
Yes or no?
High-end or budget?
Must-haves / nice-to-haves?
Red flags?
Yes or no?
High-end or budget?
Must-haves / nice-to-haves?
Red flags?
This is true. 🧪
Measles is a bellwether. Because it’s the most contagious vaccine-preventable disease, when vaccination rates drop, it’s the first to start spreading.
Now we’ve got mumps rolling up.
Expect more.
This is just the beginning of RFK Jr.’s successful infectious disease reintroduction plan.
Now we’ve got mumps rolling up.
Expect more.
This is just the beginning of RFK Jr.’s successful infectious disease reintroduction plan.
Maryland health officials warn providers about an upsurge in mumps cases
Maryland health officials are warning about an uptick in cases of mumps.
www.thebanner.com
February 16, 2026 at 12:59 AM
This is true. 🧪
Time for some new #knitting. Just downloaded this pattern for a Norwegian Resistance Hat, originally protesting against the Nazis in WW2, now repurposed as a 'Melt the ICE' statement. But please someone, tell me a good rebellious wool to get. I am tricoteuse. TY 🧶
www.ravelry.com/patterns/lib...
www.ravelry.com/patterns/lib...
Melt the ICE Hat pattern by Paul S Neary
In the 1940’s, Norwegians made and wore red pointed hats with a tassel as a form of visual protest against Nazi occupation of their country. Within two years, the Nazis made these protest hats illegal...
www.ravelry.com
February 15, 2026 at 10:34 AM
Time for some new #knitting. Just downloaded this pattern for a Norwegian Resistance Hat, originally protesting against the Nazis in WW2, now repurposed as a 'Melt the ICE' statement. But please someone, tell me a good rebellious wool to get. I am tricoteuse. TY 🧶
www.ravelry.com/patterns/lib...
www.ravelry.com/patterns/lib...
"Data not available"?
How many centuries ago did we establish that it's a good idea to have accurate, timely data on factors that can contribute to major infectious disease outbreaks?
How many centuries ago did we establish that it's a good idea to have accurate, timely data on factors that can contribute to major infectious disease outbreaks?
London has the lowest rates of MMR immunisation in the country. Map via @houseofcommons.parliament.uk library.
February 15, 2026 at 9:53 AM
"Data not available"?
How many centuries ago did we establish that it's a good idea to have accurate, timely data on factors that can contribute to major infectious disease outbreaks?
How many centuries ago did we establish that it's a good idea to have accurate, timely data on factors that can contribute to major infectious disease outbreaks?
Reposted by Trish Greenhalgh
London measles outbreak, more than 60 children affected.
No paywall
No paywall
February 14, 2026 at 7:52 PM
London measles outbreak, more than 60 children affected.
No paywall
No paywall
Reposted by Trish Greenhalgh
Missed this the other day. Really important methods issue.
Short thread on our new paper. We use face mask efficacy research as a “stress test” for systematic review methods. We analysed 66 systematic reviews of face mask efficacy; they reached widely different conclusions (~half said they work, half said that evidence of efficacy was lacking). 1/
Our new paper:
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
February 14, 2026 at 8:03 AM
Missed this the other day. Really important methods issue.
Seriously bad. America axes pandemic preparedness programme.
The pandemic preparedness programme at NIAD is to be cut in yet another inexplicable decision by Bhattacharya. Without the research that was done by institutes such as the NIAD that was already looking at coronaviruses we would not have had such speedy vaccine development 🧪🧵 #HealthPolicy
Exclusive: Key US infectious-diseases centre to drop pandemic preparation
Staff members have been instructed to scrub this topic and ‘biodefense’ from the agency’s website.
www.nature.com
February 14, 2026 at 8:54 AM
Seriously bad. America axes pandemic preparedness programme.
Reposted by Trish Greenhalgh
🧵1/ As the 2026 Munich Security Conference opens today, Jon Cylus & I ask, in a new paper @lancetrh-europe.bsky.social ,how the 2025 U.S. National Security Strategy reshapes not only geopolitics but Europe’s health and welfare systems.
February 13, 2026 at 5:12 AM
🧵1/ As the 2026 Munich Security Conference opens today, Jon Cylus & I ask, in a new paper @lancetrh-europe.bsky.social ,how the 2025 U.S. National Security Strategy reshapes not only geopolitics but Europe’s health and welfare systems.
Reposted by Trish Greenhalgh
🧵(1/2): Essential new paper: "Toxic experts in longevity business: A multilevel relational framing of emergence"
Draws on multiple examples, including the way medical pseudoexperts botched the pandemic.
journals.sagepub.com/doi/10.1177/...
#medsky #scisky #standupforscience #longCOVID #cdnpoli
Draws on multiple examples, including the way medical pseudoexperts botched the pandemic.
journals.sagepub.com/doi/10.1177/...
#medsky #scisky #standupforscience #longCOVID #cdnpoli
February 11, 2026 at 12:19 PM
🧵(1/2): Essential new paper: "Toxic experts in longevity business: A multilevel relational framing of emergence"
Draws on multiple examples, including the way medical pseudoexperts botched the pandemic.
journals.sagepub.com/doi/10.1177/...
#medsky #scisky #standupforscience #longCOVID #cdnpoli
Draws on multiple examples, including the way medical pseudoexperts botched the pandemic.
journals.sagepub.com/doi/10.1177/...
#medsky #scisky #standupforscience #longCOVID #cdnpoli
Reposted by Trish Greenhalgh
Waiting rooms aren’t riskier than any other crowded environment…?
I can’t stop laughing.
Of course they are.
You have two groups of people in the waiting room.
montrealgazette.com/news/local-n...
I can’t stop laughing.
Of course they are.
You have two groups of people in the waiting room.
montrealgazette.com/news/local-n...
Worried about catching a bug in a hospital waiting room? Here's what infectious disease experts say
You can lower the risk, but you can't eliminate it. That being said, waiting rooms aren't necessarily riskier than other packed environments.
montrealgazette.com
February 10, 2026 at 6:44 PM
Waiting rooms aren’t riskier than any other crowded environment…?
I can’t stop laughing.
Of course they are.
You have two groups of people in the waiting room.
montrealgazette.com/news/local-n...
I can’t stop laughing.
Of course they are.
You have two groups of people in the waiting room.
montrealgazette.com/news/local-n...
Reposted by Trish Greenhalgh
Short thread on our new paper. We use face mask efficacy research as a “stress test” for systematic review methods. We analysed 66 systematic reviews of face mask efficacy; they reached widely different conclusions (~half said they work, half said that evidence of efficacy was lacking). 1/
Our new paper:
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy | Research Synthesis Methods | Cambridge Core
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
www.cambridge.org
February 8, 2026 at 10:18 AM
Short thread on our new paper. We use face mask efficacy research as a “stress test” for systematic review methods. We analysed 66 systematic reviews of face mask efficacy; they reached widely different conclusions (~half said they work, half said that evidence of efficacy was lacking). 1/
Reposted by Trish Greenhalgh
'As climate change accelerates, weak infrastructure and poor crisis planning will worsen deadly weather impacts. Protecting people indoors must become a priority, focusing on thermal comfort, ventilation, and reducing indoor air pollutants.' #AirQuality
wires.onlinelibrary.wiley.com/doi/10.1002/...
wires.onlinelibrary.wiley.com/doi/10.1002/...
The Rapid Progress of Climate Change Requires Effective Concepts for Protecting People Indoors
As climate change progresses, society is increasingly exposed to extreme weather events. It is therefore necessary to adapt our buildings, housing infrastructure, and logistics to protect people and ...
wires.onlinelibrary.wiley.com
February 9, 2026 at 5:25 PM
'As climate change accelerates, weak infrastructure and poor crisis planning will worsen deadly weather impacts. Protecting people indoors must become a priority, focusing on thermal comfort, ventilation, and reducing indoor air pollutants.' #AirQuality
wires.onlinelibrary.wiley.com/doi/10.1002/...
wires.onlinelibrary.wiley.com/doi/10.1002/...
Reposted by Trish Greenhalgh
Always on brand surgeon thinking: vaccines as an individual option rather than collective infrastructure. May every Lego find your bare foot.
“Not all illnesses are equally dangerous & not all people are equally susceptible…But measles is one you should get your vaccine.”
“Not all illnesses are equally dangerous & not all people are equally susceptible…But measles is one you should get your vaccine.”
‘Take the vaccine, please,’ Dr Oz urges amid rising measles cases in US
Health official’s endorsement comes as South Carolina faces hundreds of cases and US risks losing elimination status
www.theguardian.com
February 9, 2026 at 10:39 AM
Always on brand surgeon thinking: vaccines as an individual option rather than collective infrastructure. May every Lego find your bare foot.
“Not all illnesses are equally dangerous & not all people are equally susceptible…But measles is one you should get your vaccine.”
“Not all illnesses are equally dangerous & not all people are equally susceptible…But measles is one you should get your vaccine.”
Reposted by Trish Greenhalgh
February 8, 2026 at 4:55 PM
Reposted by Trish Greenhalgh
Review articles and meta-analysis *should* be great ways to summarize scientific literature
How, then, do they go horribly wrong, like the notorious Cochrane review on respirator masks?
Prof. Greenhalgh and colleagues document the "sausage making" involved in 66 different face-mask review articles
How, then, do they go horribly wrong, like the notorious Cochrane review on respirator masks?
Prof. Greenhalgh and colleagues document the "sausage making" involved in 66 different face-mask review articles
Short thread on our new paper. We use face mask efficacy research as a “stress test” for systematic review methods. We analysed 66 systematic reviews of face mask efficacy; they reached widely different conclusions (~half said they work, half said that evidence of efficacy was lacking). 1/
Our new paper:
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
February 8, 2026 at 9:50 PM
Review articles and meta-analysis *should* be great ways to summarize scientific literature
How, then, do they go horribly wrong, like the notorious Cochrane review on respirator masks?
Prof. Greenhalgh and colleagues document the "sausage making" involved in 66 different face-mask review articles
How, then, do they go horribly wrong, like the notorious Cochrane review on respirator masks?
Prof. Greenhalgh and colleagues document the "sausage making" involved in 66 different face-mask review articles
Reposted by Trish Greenhalgh
On improving research methods:
(Not actually about masks)
(Not actually about masks)
Short thread on our new paper. We use face mask efficacy research as a “stress test” for systematic review methods. We analysed 66 systematic reviews of face mask efficacy; they reached widely different conclusions (~half said they work, half said that evidence of efficacy was lacking). 1/
Our new paper:
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
February 8, 2026 at 1:39 PM
On improving research methods:
(Not actually about masks)
(Not actually about masks)
Short thread on our new paper. We use face mask efficacy research as a “stress test” for systematic review methods. We analysed 66 systematic reviews of face mask efficacy; they reached widely different conclusions (~half said they work, half said that evidence of efficacy was lacking). 1/
Our new paper:
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy | Research Synthesis Methods | Cambridge Core
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
www.cambridge.org
February 8, 2026 at 10:18 AM
Short thread on our new paper. We use face mask efficacy research as a “stress test” for systematic review methods. We analysed 66 systematic reviews of face mask efficacy; they reached widely different conclusions (~half said they work, half said that evidence of efficacy was lacking). 1/
Reposted by Trish Greenhalgh
Evidence has emerged that RFKJr lied about his infamous 2019 trip to Samoa after which measles vax uptake plummeted and measles cases spiralled resulting in 83 deaths and thousands of measles cases …🧵 #HealthPolicy
Newly revealed emails undermine RFK Jr testimony about 2019 Samoa trip ahead of measles outbreak
Kennedy later said the purpose of his trip had nothing to do with vaccines. US embassy and UN staff at the time said otherwise, emails show
www.theguardian.com
February 7, 2026 at 8:20 AM
Evidence has emerged that RFKJr lied about his infamous 2019 trip to Samoa after which measles vax uptake plummeted and measles cases spiralled resulting in 83 deaths and thousands of measles cases …🧵 #HealthPolicy
Reposted by Trish Greenhalgh
Our new paper:
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy | Research Synthesis Methods | Cambridge Core
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
www.cambridge.org
February 6, 2026 at 10:25 AM
Our new paper:
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Our new paper:
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy | Research Synthesis Methods | Cambridge Core
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
www.cambridge.org
February 6, 2026 at 10:25 AM
Our new paper:
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
Synthesis challenges in complex evidence: A critical analysis of systematic reviews of face mask efficacy
#episky #healthpolicy #medsky
www.cambridge.org/core/journal...
To those who asked "What is this 'workable solution'?", see our paper in Science:
www.science.org/doi/full/10....
www.science.org/doi/full/10....
February 6, 2026 at 1:42 AM
To those who asked "What is this 'workable solution'?", see our paper in Science:
www.science.org/doi/full/10....
www.science.org/doi/full/10....
Reposted by Trish Greenhalgh
Cornwall based antivax physician David Cartland got a letter from DBS (Disclosure and Barring Service) preventing him from working with children and vulnerable populations. Basically his medical career is over.
My question here is WHY CAN'T WE HAVE NICE THINGS HERE IN THE US?!?
My question here is WHY CAN'T WE HAVE NICE THINGS HERE IN THE US?!?
February 5, 2026 at 9:07 PM
Cornwall based antivax physician David Cartland got a letter from DBS (Disclosure and Barring Service) preventing him from working with children and vulnerable populations. Basically his medical career is over.
My question here is WHY CAN'T WE HAVE NICE THINGS HERE IN THE US?!?
My question here is WHY CAN'T WE HAVE NICE THINGS HERE IN THE US?!?
Important paper. Schools are high-risk environments for respiratory disease transmission MAINLY because classrooms are underventilated. This problem has a workable solution - it just needs political will. Air quality is as important as water quality for public health. MT @martinmckee.bsky.social
Our paper modelling transmission risk in schools is published in Nature Communications. **The relative contribution of close-proximity contacts, shared classroom exposure and indoor air quality to respiratory virus transmission in schools** doi.org/10.1038/s414...
February 5, 2026 at 10:59 PM
Important paper. Schools are high-risk environments for respiratory disease transmission MAINLY because classrooms are underventilated. This problem has a workable solution - it just needs political will. Air quality is as important as water quality for public health. MT @martinmckee.bsky.social
Reposted by Trish Greenhalgh
