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Medicine

WHO To Review Evidence of Airborne Transmission of Coronavirus (nytimes.com) 252

After hundreds of experts urged the World Health Organization to review mounting scientific research, the agency acknowledged on Tuesday that airborne transmission of the coronavirus may be a threat in indoor spaces. The New York Times reports: W.H.O. expert committees are going over evidence on transmission of the virus and plan to release updated recommendations in a few days, agency scientists said in a news briefing. The possibility of airborne transmission, especially in "crowded, closed, poorly ventilated settings, cannot be ruled out," said Dr. Benedetta Allegranzi, who leads the W.H.O.'s committee on infection prevention and control. She said the agency recommends "appropriate and optimal ventilation" of indoor environments, as well as physical distancing.

Agency staff fielded several questions from reporters about transmission of the virus by air, prompted by an open letter from 239 experts calling on the agency to review its guidance. Many of the letter's signatories have collaborated with the W.H.O. and served on its committees. [...] W.H.O. scientists said that for the past few months, the infection prevention committee has been weighing the evidence on all the ways in which the coronavirus spreads, including by tiny droplets or aerosols. "We acknowledge that there is emerging evidence in this field, as in all other fields," Dr. Allegranzi said. "And therefore, we believe that we have to be open to this evidence and understand its implications regarding the modes of transmission and also regarding the precautions that need to be taken." It will also be important to understand the importance of transmission by aerosols compared with larger droplets, and the dose of the virus needed for infection from aerosols, she said. "These are fields that are really growing and for which there is evidence emerging, but it is not definitive," she said. "However, the evidence needs to be gathered and interpreted, and we continue to support this."

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WHO To Review Evidence of Airborne Transmission of Coronavirus

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  • by h33t l4x0r ( 4107715 ) on Wednesday July 08, 2020 @04:37AM (#60274522)
    They should smash their guitars after every press conference:
    Is it aitborne?
    > *We don't fucking know!* smash
  • by ytene ( 4376651 ) on Wednesday July 08, 2020 @06:21AM (#60274648)
    Before I start, I need/want to make one thing crystal clear: this comment is NOT intended to be critical of any party - be that a nation state, government, organization or individual.

    In the last 20-30 years, the world has experienced a number of outbreaks of infectious diseases that have caused significant concern at a global scale. Examples include:-

    H5N1 Bird Flu
    H1N1 Swine Flu
    Ebola
    SARS-Cov03
    MERS-Cov12
    Covid-19

    plus "lesser" infections, including:-
    BSE, "Mad Cow Disease"
    Numerous "Foot and Mouth" outbreaks
    the list goes on...

    ...and likely a bunch that I should have included but didn't because I pulled the above list from my defective memory.

    Although the means by which each of these infections is transmitted is crucial to our ability to contain and ultimately defeat them, our ability to develop a long term strategy may well depend on the earliest stages of these infections making their way in to humans. Specialists talk about the ability of a virus to "jump the species barrier" - i.e. the H5N1 Bird Flu developing the ability to infect humans. But a more interesting question may be to ask not about the biological ability of the virus to cross species, but the circumstances in which that inter-species transmission took place.

    I've read smatterings of on-line discussions [and have no way to determine their veracity] which suggest that, for example, H5N1 may have made the jump from domesticated fowl [chickens] to humans because of a particularly cold winter that prompted farmers in remote areas of Asia, who kept chickens, to bring their birds into the same space that was occupied by their families, to prevent the birds from literally dying of cold. Similarly, there is the suggestion that the epi-center of the Covid-19 outbreak was a fresh food market that dealt in what we in the west would consider unusual or exotic foods.

    If there is any substance to these anecdotes [and that's a big 'if'] then perhaps one of the most substantive things we can do to reduce the risk of future outbreaks is to ensure that there are much more stringent health practices anywhere humans come in to contact with other species - and in particular all forms of livestock farming, plus, even more importantly, the entire length of the human food chain.

    Having to face future potential infectious disease outbreaks when not prepared is worrying enough, but we should be looking beyond that to figure out what practices we need to change to stop or reduce the risk of future outbreaks.

    If we want to continue with relatively non-impacted lives [i.e. the freedom to travel where we want, when we want] without taking excessive risks or being subject to quarantine restrictions, then we have to go to the source and tackle the issue there.

    Nobody seems to be even raising this yet [perhaps because we're still in the middle of the present crisis] but maybe these are questions we should be asking.
    • by rldp ( 6381096 )

      We know what we have to do to reduce the risk of future outbreaks.

      Only Trump has the will to actually do it. The left is too addicted to chinese fentanyl.

    • This is the crazy thing. A lot of diseases can be prevented or stopped entirely if everyone just washed their hands before and after eating. Ditto after interacting with any potential vector for infection, including animals. Really, that's it. Wash your hands.

    • by Merk42 ( 1906718 )

      Having to face future potential infectious disease outbreaks when not prepared is worrying enough, but we should be looking beyond that to figure out what practices we need to change to stop or reduce the risk of future outbreaks.

      But that involves doing things that inconvenience me!!!
      I'm more important than everyone else! You can't make me do it, it's a free country!

  • by wiredog ( 43288 ) on Wednesday July 08, 2020 @06:38AM (#60274678) Journal

    CEPI [cepi.net] works closely with WHO. A major problem is that WHO is staffed with scientists who aren't public relations people, that is, communication with the public isn't their specialty. So what a word or phrase means to them, in their scientific understanding, is not what it means to the general public. So when they say "airborne transmission" they mean something different than "droplet transmission". That is, to them, spreading through sneezing, coughing, or even talking, is not necessarily "airborne" transmission. It's "droplet" transmission.

    The public, of course, thinks that if it spreads through the air (whether via droplets or small virions) it's "airborne".

    Epidemiology is not the only highly technical field that has this problem.

    • by khchung ( 462899 ) on Wednesday July 08, 2020 @07:16AM (#60274764) Journal

      CEPI [cepi.net] works closely with WHO. A major problem is that WHO is staffed with scientists who aren't public relations people, that is, communication with the public isn't their specialty. So what a word or phrase means to them, in their scientific understanding, is not what it means to the general public.

      The problem isn't with the scientists, the problem with the journalists who report on highly technical field without the basic understand of the jargon used in the field.

      Imagine reading a report of an American Football game, by a journalist who did not know what a "quarterback" is, and assumed it mean the back of a quarter (the coin). THAT is the level of understanding most journalist reporting on science and medicine have nowadays.

      The journalist writing up the news should be the one clarifying any jargon that might confuse the general public, supposedly that's one of the value provided by journalists. But no, knowledgeable journalist costs too much, so we have news written by "journalists" who knew nothing.

    • Pssshhht. Everyone knows airborne transmission means getting sick on airplanes and taking the virus to new locations.
    • Indeed. I've seen one of the authors of the open letter to the WHO explaining on Twitter what they really wanted to say and the dillemma of using technical terms vs public communication:

      1) Airbone vs "opportunistic airbone" [twitter.com]:
      I am one of the scientists who wrote the paper. A critical problem, described by @apoorva_nyc, is lack of nuance on "airborne."

      More accurate is "opportunistic airborne", transmits well indoors under crowded, low ventilation, long duration, no masks. Avoid each of those!

      2) Aerosol vs true [twitter.com]

    • by hey! ( 33014 )

      It's not that epidemiologists are stubbornly attached to hair-splitting technical distinctions -- although that happens. Epidemiologists are uniquely concerned with *practical courses of action*. Should we *treat* COVID-19 as airborne? The answer can still be "no" even if airborne transmission occasionally happens.

      I've read the letter to Clinical Infectious Diseases and it is mainly concerned with the *theoretical* possibility of aerosol transmission -- something that nobody disputes. The real disagreemen

  • by Martin S. ( 98249 ) on Wednesday July 08, 2020 @06:51AM (#60274706) Journal

    This is how science works, everything is under constant review, things changes, new data, new insights.

    That is what the idiots cannot grasp.

    • And also scientists can just be wrong. The correct way to approach the problem of aerosol infectivity is to actually investigate the problem. Test it. Almost no one has done that. Apparently just making assumptions is considered a better strategy. Science that is not even if scientists are doing it.

      • I think it is harder than you think to test for that hypothesis. The question is basically whether COVID is infectious via the air (we don't really care if it travels in the air but the virus dies along the way). How do you test for that in a rigorous way? You need to demonstrate that it is possible for people (or perhaps mice) to get infected via that mechanism rather than, say, being infected via droplets or other mechanisms.

        There are strong suspicions (e.g. cases that are hard to explain otherwise) that

        • I think it is harder than you think to test for that hypothesis. The question is basically whether COVID is infectious via the air (we don't really care if it travels in the air but the virus dies along the way). How do you test for that in a rigorous way?

          If the scientists can't test for it (for whatever reason), then it stops being science and starts being their opinion. Yes, they're allowed to have an opinion, but being scientists doesn't suddenly make their opinion any more worthwhile than MY opinion (n

          • First, I am not saying that they can't test. I am just saying that they probably can't test in a short period of time.

            I disagree about your statement on opinions. If you have a lot of familiarity with a subject you can have an informed opinion that is more likely to be right than other opinions. So I would privilege their opinion over, say, someone who has no experience with dealing with viral infections, on whether or not it is likely to be spread by air. You still have to treat it as opinion, but you can

      • Of course those stupid scientists are wrong. Psshhtt, a gut feeling and a few obtuse anecdotes is much better than some kind of stupid test. /s
    • The rabble need somewhere to focus their enmity
      • Don't think your passive-aggressiveness would somehow classify as friendly. At best does it make you a scientist and an idiot.

    • Let's review the recent proclamations of your precious WHO, which totally isn't playing this down to help the Chinese Communist Party save face:

      "There's no evidence of a novel infectious disease in Wuhan, no need to worry."
      "There's no evidence of human to human transmission, no need to worry."
      "There's no evidence of asymptomatic transmission, no need to worry."
      "There's no evidence that wearing a face covering helps prevent infection, no need to bother with one."
      "There's no evidence of aerosol transmission,

    • It doesn't matter what idiots grasp. When scientists produce excuses and not result then we're all doomed.

  • The CDC guidelines at least as far back as in early March had stated transmission was by small dropletsin the air. Plus there were modeling studies from MIT and others reported in the news showing transmissionout to 20 feet or so, e.g. across grocery store aisles. This debate must be about droplets staying in the air for a long time, as it's not news that droplets in the air are a vector. Also infectious disease experts familiar with other outbreaks on cruise ships stated the closed ventilation systems are

  • by Joe2020 ( 6760092 ) on Wednesday July 08, 2020 @10:52AM (#60275250)

    Most scientists know fog isn't steam, but it's droplets of water, and fog can certainly float in the air and remain there for a long time when the conditions are right. The same is true for molecules, which may not spread everywhere or remain in place either under certain conditions.

    This distinction between what is and isn't airborne makes less and less sense the smaller particles get. If anything should this discussion have been about the size and research should have been done a long time ago to come to practical conclusions and not to create further debates.

    Why are scientists arguing over something so fundamental as this and in this late into an outbreak? It is embarrassing and makes no sense at all.

  • "The possibility of airborne transmission, especially in "crowded, closed, poorly ventilated settings, cannot be ruled out,"

    This is what they are doing wrong. They should assume it is airborne unless evidence shows otherwise.

    i.e. assume yes instead of assume no

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