Distance, masks and eye protection

by CHZ



Lancet, Physical distancing, face masks, and eye protection to
prevent person-to-person transmission of SARS-CoV-2 and
COVID-19: a systematic review and meta-analysis
1st June, COVID-19 Systematic Urgent Review Group Effort (SURGE)

https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)31142-9/fulltext

https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)31183-1/fulltext

https://www.theguardian.com/world/2020/jun/01/risk-of-infection-could-double-if-2-metre-rule-reduced-study-finds

Methods
Meta-analysis

Physical distance, face masks, eye protection

172 observational studies, 16 countries, 6 continents

N = 25, 697, patients with Covid-19, SARS, MERS

No randomised controlled trials

Physical distance

Less than 1 metre = 13% risk

More than 1 metre, 3% risk

2 metres = 1.5% risk

3 metres = 0.75% risk

Face masks

N = 2,647

Wearing a mask risk = 3% risk of infection

Not wearing a mask 17% risk of infection

stronger associations with N95 or similar respirators

Eye protection
Associated with less infection (n=3713) aOR = 0·22

Interpretation
Quantitative estimates for models and contact tracing policy

Robust randomised trials needed

Systematic appraisal of currently best available evidence

WHO, 1 metre

https://www.coronavirus-statistiques.com/stats-pays/covid-19-cases-uk/

source

37 comments

James Walker November 20, 2020 - 2:29 am

I've always thought wearing a mask must afford some protection to the wearer. It just makes sense, and I could never understand why people, including your good self, said it was just to protect others.

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Lion King November 20, 2020 - 2:29 am

i thought there were a lot of studies showing that masks are useless to stop viruses and can actually increase your risk of infection

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Drewtazy November 20, 2020 - 2:29 am

Their goal with this Mask wearing is it is a visual reminder of this pandemic (scamdemic), every time we leave our homes.
Keep us in fear.

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R dP November 20, 2020 - 2:29 am

What a great guy! Thanks Doc 😁

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GhostShadowGaming November 20, 2020 - 2:29 am

Lmao the WHO…… the crooked organization making millions off of people's sickness……this was a shitty video lmao

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colin brazier November 20, 2020 - 2:29 am

To eliminate infection turn off your mainstream media brainwashing platform

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frugal Mum November 20, 2020 - 2:29 am

How does the distance measures/% compare to the mask/no mask %?

Did the mask tests factor in misuse vs proper use?

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Jeff R. Bowman November 20, 2020 - 2:29 am

The reason governments and universities have not "bothered" to run randomized control groups (RCG) most likely has to do with ethics. Here is what the Mayo Clinic writes about this:

"Randomized controlled trials (RCTs) are most ethically controversial when offering potential participants randomization into a placebo arm that could result in individual harm, especially serious physical harm including additional pain, suffering, or death…"

https://www.mayoclinicproceedings.org/article/S0025-6196(20)30389-X/pdf

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Eddy Makaspag November 20, 2020 - 2:29 am

Your source of information is the COVID-19 Systematic Urgent Review Group Effort (SURGE)? A group that literally appeared out of the blue to generate this crap. Pathetic.

Why don't you read the CDC's own review of the data. A proper study by real scientists.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7263814/pdf/main.pdf

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Name Withheld November 20, 2020 - 2:29 am

Wear a face mask so that you can catch the virus in your eyes instead

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Cville Merton November 20, 2020 - 2:29 am

Thanks for the videos. A question to anyone: How could a randomized controlled study about coronavirus transmission and mask-wearing be ethical? Could you tell someone they can't wear a mask and they must get exposed just as much as the cohort wearing masks?

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Tommy Sullivan November 20, 2020 - 2:29 am

Neither do these global corporations, theyre full of sh8t also 😂

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Tommy Sullivan November 20, 2020 - 2:29 am

I think the government doesnt understand shift

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Robert Twiddy November 20, 2020 - 2:29 am

Kinda late for the UK, Thailand and rest of Asia wearing masks since February. Also face shields. All readily available in 711 or Homepro (like B&Q). Academics have no real experience especially in Europe and USA. We do same as Malaysia example. Hence numbers very low. You put your money in a basket with sanitizer, the shop assistant wears gloves, picks up money puts change back in you pick up and then sanitize. Masks here are compulsory. Another study shows N95 masks quarters the risk rate as they block anything coming in more. 3m 8910 masks. Surgical ones or linen ones tally with your numbers. However 3m ones difficult to breathe in so ok if you are forced to crowded situations. Current cases 0, total cases 3125 yesterday, deaths 58. Track and trace 1 month old checkin/checkout a place. If you are in area with infection you go for free test as opposed to Hancock half hours quarantine! UK seem to be continually in catch up mode and dont listen (SAGE or too much GASE more likely). Common sense limited in UK

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Maria Munoz-Yepes November 20, 2020 - 2:29 am

So masks are as good as the famous 2 metre distance that they are imposing in the UK. I wonder wouldn't it be better to make masks compulsory and keep one metre distance instead?

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• VH November 20, 2020 - 2:29 am

Have you heard that 80% aren’t even susceptible to catching the virus?

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Warrior Gospel November 20, 2020 - 2:29 am

How do we account for the additional 4%? The distance study shows 13-3% and the mask study shows 17-3%. Where is the delta of 4% come from?

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Jen Jem November 20, 2020 - 2:29 am

Dr.Campbell,
I truly believe that you will live forever.
The world is🥺 spinning so fast, catching fire. You have been such an absolute Shepherd. Quieting fears. Being stable and reliable. This world trauma will show who is who. Part of the problem, or part of the solution.
You will be an asset to the new world.
The unsung hero.
You are loved and respected universally.

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dave brumpton November 20, 2020 - 2:29 am

This is pure Bill Gates narrative. Be warned.

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Bene Butterbean November 20, 2020 - 2:29 am

Question: Are all the distancing rules, mask, and glove-wearing, limited gathering, etc. meant to protect Society or the Individual. I believe that this is a subject that needs some discussion.

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Paul Jenkins November 20, 2020 - 2:29 am

What are your views on temperature testing. The authorities in the country of my country, Canada, do not seem to believe it to be effective.

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Sleep Smart Smash Stress November 20, 2020 - 2:29 am

Mask use is going to give police a huge headache in perpetrator identification

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Jo Ann Cook November 20, 2020 - 2:29 am

As a Canadian, I do not feel the need to defend Justin Trudeau but just to add a fact that one of the first notable figures to have tested positive for the virus, was his wife. Although Justin himself was never tested because he did not show symptoms, I would assume that the odds were that he would have had the virus as well. They did self isolate for the required time until his wife was declared negative for the virus. While it is not a good example to set by immersing yourself in a crowd whether you think that you are immune or not, most Canadians have seen that he doesn't necessarily follow the rules that he gives for the rest of us and hopefully are sensible enough to not follow his example.

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Cleara Henderson November 20, 2020 - 2:29 am

Thanks

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Julia Janssens ღ November 20, 2020 - 2:29 am

GOOD FACE MASK VIDEO: https://www.youtube.com/watch?v=pgVs4cEcKpw This mask is made with RIGHT-SIDE of material FACING OUTWARDS. There are lots of face mask videos on internet but this is the simplest and easiest I have found. PLEASE NOTE : your piece of material will be 9" x 22" which folds to 9" x 11" and then becomes 8" x 10" when turned in on edges, and then 8" x 7" approx. after being pleated. Takes half hour to make but you will get quicker the more you make.

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Cassie G. November 20, 2020 - 2:29 am

Thank you Doc!

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Julia Janssens ღ November 20, 2020 - 2:29 am

GOOD FACE MASKS – an excellent video on how to make a face-mask :https://www.youtube.com/watch?v=9QrW4zIjMwY

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Friendly Pharmacy 5 November 20, 2020 - 2:29 am

Canadian Pharmacist here: 2 minute video on proper use of Masks! Thanks Dr!
https://youtu.be/S55DyZRCF4Y

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abulho batte November 20, 2020 - 2:29 am

Dr that HCC data was rigged and WHO took the bait / data analytics was done by a phony company

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Sleep Smart Smash Stress November 20, 2020 - 2:29 am

Don’t speak Nude Covidese Think of face mask as cigarette filter. If you are going to smoke tobacco use a filter. The filter is for others around you. If you wish not to speak or sing you may not use mask. You tend to Speak (and Sing) COVID-19 if you are an asymptomatic or PR symptomatic carrier and you are sheeding the virus by the buckets if you are sick with COVID19, Don’t speak Nude Corvids. Even if there are rare minor side effects of masks the benefits far outweigh the benefits. How woud you study the side effects of mask use?
https://www.jwatch.org/na51616/2020/06/01/you-can-speak-and-sing-covid-19

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Christine P November 20, 2020 - 2:29 am

Just look at the countries that have been successful and emulate their practices:. Vietnam, Taiwan, and New Zealand. I prefer the Taiwan and Vietnam strategy whereby masks were mandated and worn at all times outside the home from very early on. The population accepts this practice and is accustomed to it. Vietnam had no deaths, Taiwan only 7. No schools or businesses were closed, only borders were shut. New Zealand used draconian full lockdown measures and did quite well also, but not as well and their economy suffered.

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Pauline Margaret Pietersen November 20, 2020 - 2:29 am

Hi Dr Campbell I have 2 videos for you regarding the making of Face Masks, very simple. Do you have an email address that you would like me to forward them too?

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RWBHere November 20, 2020 - 2:29 am

These risk (infection) percentages which keep being mentioned by people online and in printed literature are concerning, because there is no frame of reference given. To explain: 

Do the figures refer to walking past one other person with/without infection? 
Are they derived from people seated near to each other? 
Do they pertain to being near a group of other people? 
Or do they apply to people being together for a specific time period? 
Are they derived from figures in a small room, a large room, on public transport, in a crowded mall or outdoors in a park or street? 
For what age groups do they apply? 
What type(s) of masks are being used? 
Are the people at rest, ill in bed, walking or exerting themselves? All of the latter affect the way we breathe. 
One might also ask, 'What are the prevailing ambient or weather conditions at the times of estimation?' 
You might think of other questions to ask.

There are, as you can see, a large number of variables, all of which affect the risk of contagion by a virus. As published, the figures are really meaningless, unless the situation and test conditions are specified clearly.

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Totally Useless November 20, 2020 - 2:29 am

Honestly for social distancing for it to work it would need to be 30ft. I don't know who made up 2m. As if it's not very contagious

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castlerock58 November 20, 2020 - 2:29 am

The interesting question is what are your chances of infected if the infected person is wearing the mask or if you AND the infected person is wearing a mask. That would tell us is requiring masks on everyone in public is a viable strategy. It is way easier to do than lockdown,

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roy mcintosh November 20, 2020 - 2:29 am

All the doctors/experts can do is agree to disagree and the perfidious politicians/media then spread the scaremongering shoite like wild fire!

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Sanjeev Baral November 20, 2020 - 2:29 am

Hello from Nepal

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