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Medicine Science

'Nature' Urges More Masks, Air Purifiers, and Ventilation Instead of Disinfecting Surfaces (nature.com) 164

"Catching the coronavirus from surfaces is rare. The World Health Organization and national public-health agencies need to clarify their advice," urges an editorial in Nature (shared by long-time Slashdot reader AmiMoJo): A year into the pandemic, the evidence is now clear. The coronavirus SARS-CoV-2 is transmitted predominantly through the air — by people talking and breathing out large droplets and small particles called aerosols.

Catching the virus from surfaces — although plausible — seems to be rare. Despite this, some public-health agencies still emphasize that surfaces pose a threat and should be disinfected frequently. The result is a confusing public message when clear guidance is needed on how to prioritize efforts to prevent the virus spreading... People and organizations continue to prioritize costly disinfection efforts, when they could be putting more resources into emphasizing the importance of masks, and investigating measures to improve ventilation. The latter will be more complex but could make more of a difference.

Now that it is agreed that the virus transmits through the air, in both large and small droplets, efforts to prevent spread should focus on improving ventilation or installing rigorously tested air purifiers. People must also be reminded to wear masks and maintain a safe distance. At the same time, agencies such as the WHO and the CDC need to update their guidance on the basis of current knowledge. Research on the virus and on COVID-19 moves quickly, so public-health agencies have a responsibility to present clear, up-to-date information that provides what people need to keep themselves and others safe.

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'Nature' Urges More Masks, Air Purifiers, and Ventilation Instead of Disinfecting Surfaces

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  • by dmay34 ( 6770232 ) on Sunday February 07, 2021 @07:44AM (#61036836)

    Exposure is a function of dosage and duration.

    Masks, even cheap cloth masks, help reduce dosage. They don't reduce them to zero, it's not absolute protection, but they do help reduce the dosage. However, if you are in an area of exposure for a long enough time, like your office or your school classroom, the duration becomes the primary concern and the mask's effectiveness are reducing dosage becomes nullified. The means that wearing a mask is highly effective at reducing spread for short term exposures (like going to the grocery store or a restaurant), but isn't adequate for long term exposures and we still need to keep offices and schools closed as much as possible.

    Wear a mask when you go out.
    If you can work from you you should.
    If you can do distance learning you should.

    All other exposure pathways you are concerned about are very rare.

    This isn't that complicated people.

    • Agreed - masks have been statistically proven to help a lot, esp if all parties in a room wear one. But if you keep going to a badly ventilated office with multiple colleagues, and one is infected, you might eventually become infected as well, it will have been mainly a delay then.
      Tangentially i am curious if the reduced load when wearing masks is a factor in the death rate now being lower than at the start of the pandemic.
      Anyway, we should indeed continue work as much as possible/allowed from home. Soc
      • by dmay34 ( 6770232 )

        The decrease in death rate in the US is a myth. The case fatality rate has actually been increasing since November.

      • by dryeo ( 100693 )

        The Doctors have got better at treating the disease, including things like not intubing people so quick and a couple of drugs that do help and even something as simple as putting people on their stomach seems to help.

    • by pruss ( 246395 )

      I am no expert, but let's do some back of the envelope calculations.

      If an 80% effective mask allows one to be safe in a 1-hour exposure, then a 95% effective (well-fitted N95) respirator will keep one safe in a 4-hour exposure in the same environment (assuming the particle size that defines effectiveness is the relevant one for viral transmission).

      A 99% effective (well-fitted N99) respirator will keep one safe 20 hours in the same environment. And a 99.97% effective (well-fitted N100) respirator will keep o

    • Risk reduction is the key here. Don't stop cleaning the surfaces though. It's still a decent action to take that don't take much effort.

      Everyone is responsible for doing their part. Avoud flying unless you must fly. It's known since a long time that it's a good way to spread diseases. Leisure shopping is also something to avoid.

      We just have to accept that the way we live packed too tight have to change.

      • by dmay34 ( 6770232 )

        Yeah, it's amazing how many people commented on this without actually reading it. Well done.

  • by xonen ( 774419 ) on Sunday February 07, 2021 @07:53AM (#61036848) Journal

    I am very happy with clean shopping carts and baskets, and people actually washing their hands, thank you. I don't care at all what the reason behind it is. Please don't discourage people.

    • Not just that, but what if one of the big reasons we're not seeing many cases based on touching surfaces is that we've finally started being responsible and cleaning more surfaces? Maybe it's only a small number of surfaces that really need to be cleaned, because people handle them for extended periods or touch them in some way other than simply brushing hands over them and thus ensure that they transfer things from them; obviously I'm thinking of shopping cart handles and PIN entry pads here. If people are

      • Put another way, how many infections in general are caught from surfaces that we should have been cleaning all along?

        One interesting bit of data is that "regular" flu cases are down. [healthline.com]

      • by HiThere ( 15173 )

        Well, that's the reason the flu is almost absent this year, but the flu isn't COVID.

        FWIW, I've considered it obvious that air borne transmission was the dominant cause ever since the Chinese restaurant case, where air flow was the only plausible case. And the first Washington state superspreader event was a choir practice, where people were being careful about surfaces.

        That aerosol transmission was important was less blatant, but it still seemed plausible to me about a year ago.

    • by Jarik C-Bol ( 894741 ) on Sunday February 07, 2021 @10:13AM (#61037128)
      I work in a grocery store, and sanitizing the carts has been part of the job since this started. That has not stopped people from complaining that we are not sanitizing the carts (we are). We also supply wipes at the door for wiping down the cart, dispenser says right on it, “Cart Wipes”.
      I have had *so* many people watch me dutifully drench the cart in sanitizing spray, then they grab about 20 wipes, and use them as gloves to push the cart around, until they manage to drop the wipes somewhere for us to pick up. The sad part is, the sanitizing spray is Alcohol and Peroxide based, so pretty safe to touch. The cart wipe packaging recommends washing your hands after handling wipes.
    • I am very happy with clean shopping carts and baskets, and people actually washing their hands, thank you. I don't care at all what the reason behind it is. Please don't discourage people.

      Most stores where I live have had antiseptic wipes available at the entrance for shopping carts for at least the last decade. I don't particularly care if I do it or an employee does.

    • Let's not forget that the October outbreak (of 2) people in NZ was traced back to specific items that were touched and surface transmission in the quarantine facility. Leading them to redo their entire quarantine procedures.

  • Profit! (Score:3, Funny)

    by Randseed ( 132501 ) on Sunday February 07, 2021 @08:30AM (#61036914)
    Step 1: Make N95-certified underwear.

    Step 2: Commission studies that show that N95 underwear probably reduces transmission ass-to-ass from seats and ass-to-respiratory from flatulence.
    Step 3: ???
    Step 4: PROFIT!

    (/s for the humor impaired.)

  • Catching the virus from surfaces â" although plausible â" seems to be rare. Despite this, some public-health agencies still emphasize that surfaces pose a threat and should be disinfected frequently.

    And in a forest fire, almost all the transmission to new trees is byflame/superheated gas contact, radiant heat, or falling burning limbs. But that doesn't mean squat if one spark crosses your fire line and ignites another patch beyond it.

    As of next Tuesday my wife and I - at extreme risk due to our age and health conditions - have been sequestered for 11 months, with only a handful of short excursions (masked, gloved, face-shielded, and immediately stripping and feeding the clothes to the washer). We've had everything delivered and handled it with gloves until rubbed down with alcohol or left for days to weeks (depending on the material) for any surface virus to degrade, like the biohazard each piece might be. We haven't caught it yet.

    My first vaccine dose was two weeks back and my wife (different health provider) is scheduled for hers next Friday. Damned skippy we're going to continue the practice for another couple months, until we've both had the second dose and 10+ days for the rated immunity to develop. (And then we'll continue with masking and sanitation until the mutant strains have died out, too. 95% is still one in twenty.)

    (If we're just "keeping the elephants away", fine. We'll keep it up anyhow. But there seem to be a lot of elephants nearby, and there aren't any in the room.)

    The result is a confusing public message when clear guidance is needed on how to prioritize efforts ...

    Oh the "poor dumb benighted public, with minds too small to hold more than one idea or do more than one thing". Rent a clue, "best and brightest" - they average brighter than you, and even those much dimmer are competent to walk and chew gum at the same time. (They're not like housecats, which manage to be smart enough to be very competent cats using brains the size of walnuts by only paying attention to one thing at a time.)

    If you want to avoid catching this, and maybe dying or being debilitated for the rest of your life, you do it ALL, and as close to ALL THE TIME as you can manage. A year sequestered means squat if you and your housemates handle "rarely transmitting" contaminated surfaces several times a day for hundreds of days - and one person in your household "wins the COVID-19 lottery" just once.

    • Re: (Score:2, Interesting)

      by AlexSasha ( 1838726 )
      Have you considered the possibility that perhaps depriving hundreds of thousands of children of proper education for a year+ to improve your and wife's chances of survival is not THAT beneficial for the human race in a long term? Just saying.
      • Having spent 12 years in the US school system I can say the kids aren’t missing much.

      • Except for some missing socializing time, my kids' online school has been as good if not better than in-person school. And, there is much less wasted time for them waiting around in lines, they are not listening to some other kid throw a fit, not experiencing getting bullied, witnessing playground fights, etc. We might even continue online school after the pandemic is under control.
    • Have you considered that being "the last man standing" may not be a particularly perspicacious course of action?

      So if you take all these precautions to prevent infection, what happens when the water-works fellows all die and your washer no longer washes? Or all the cow slaughterers die and you can no longer get dead cow as the supermarket?

      You also claim that you have "health conditions" which presumably means that you need expensive medications or other supports that require a huge number of OTHER PEOPLE.

  • Don't forget: it's not just your breath, it's your sweat evaporating and your farts, too. You want to stop all that? You have to put everyone in hazmat suits. Good luck with that.
    Meanwhile you can't get dumbass religious people to stop stuffing themselves into churches, where documentably they end up being super-spreader events, you can't get dumb teen and twenty-somethings (and even dumber older people) to stop having parties (more super-spreading), and you can't get pants-on-head idiots to stop being def
    • "You have to put everyone in hazmat suits."

      Hazmat suits are PPE. They are not OPE.

      The rest of your rant seems concerned with OPE. There is absolutely nothing preventing you from taking whatever Personal Protective measures using whatever Equipment (see that, PPE) your little heart desires.

      Why do you insist that OTHER PEOPLE take measures to protect YOU? Are you too fracking stupid to take measures to protect yourself?

      If all the SDF's (Stupid Dumb Fucks) would just exercize some personal responsibility an

  • This El Pais article [elpais.com] nicely illustrates how infections occur, based on what is happening in Spain.

    There are many factors including: masks, ventilation, duration in shared air, speaking vs. singing/shouting, ...

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