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linseymarr's profile
Linsey Marr
Linsey Marr
Linsey Marr
Verified account
@linseymarr

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Linsey MarrVerified account

@linseymarr

Engineering prof at VT with expertise in airborne transmission of viruses, air quality, nanotechnology. Intellectual omnivore and avid recreational athlete.

Blacksburg, VA
cee.vt.edu/people/lmarr.h…
Joined February 2009

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    1. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

      Why the big debate over airborne transmission? Exchanges with @OlabisiLab Matthew Meselson @kprather88 over the weekend helped me crystallize some thoughts about the disconnect. /1

      11 replies 259 retweets 574 likes
      Show this thread
    2. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

      Traditional discussion about transmission routes centers around operational definitions in infection control and prevention in hospitals. There are "airborne" diseases/precautions and "droplet" diseases/precautions. /2

      2 replies 22 retweets 141 likes
      Show this thread
    3. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

      The problem is that we have been trying to impose these operational definitions on the actual mechanisms of transmission and apply them in community (non-hospital) settings. /3

      4 replies 24 retweets 154 likes
      Show this thread
    4. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

      The mental model, then, is that airborne transmission only matters at long range, as shown in this figure, and that if transmission occurs at close range, it's due to large droplets. But how do the aerosols get to long range? /4pic.twitter.com/0UbgKsdJ4Q

      3 replies 37 retweets 168 likes
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    5. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

      This figure from our paper on myths about transmission (https://www.journalofhospitalinfection.com/article/S0195-6701(21)00007-4/fulltext …) shows a more realistic version of what's happening. Aerosols are more concentrated at close range. /5pic.twitter.com/E9rFQfDHQ1

      7 replies 113 retweets 323 likes
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    6. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

      Why do "droplet" precautions mostly work in hospitals? Hospitals have a narrower range of host and environmental factors that affect transmission. Ventilation is usually good. People aren't singing, exercising, spending hours in a room with lots of people. People wear masks. /6

      8 replies 47 retweets 237 likes
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    7. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

      Under these conditions "droplet" precautions mostly work because there are layered interventions that also address aerosols. But these precautions aren't always enough, as seen in some studies (https://www.acpjournals.org/doi/full/10.7326/M20-7567 …, https://academic.oup.com/ofid/article/8/3/ofab036/6121257 …). /7

      2 replies 32 retweets 196 likes
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    8. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

      At the same time, we don't necessarily need full "airborne" precautions with airborne infection isolation rooms because SARS-CoV-2 is not as easily transmissible as measles. But hospitals are boxed in by the operational definitions. /8

      3 replies 24 retweets 176 likes
      Show this thread
      Linsey Marr‏Verified account @linseymarr 1 Jun 2021

      For the general public, the clearest way to convey how the virus is transmitted is to call it airborne. Hospitals should not have a monopoly on the term. We live with a different meaning of the word "chart" in hospitals. /9

      9:16 AM - 1 Jun 2021
      • 73 Retweets
      • 344 Likes
      • DeathNest💉😷🐕🌎 Liz Wilson Elena Jiménez manymoremiles Karen Cohn #BetterMasksInSharedAir #CleanSharedAir Forum Kajian Pembangunan rama Paula Olsiewski Ryad
      5 replies 73 retweets 344 likes
        1. New conversation
        2. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

          @meganmolteni describes Yuguo Li's take (https://www.wired.com/story/the-teeny-tiny-scientific-screwup-that-helped-covid-kill/ …): airborne transmission is both more complicated and less scary than once believed. /10

          2 replies 56 retweets 237 likes
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        3. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

          Hospitals can maintain their definitions. Meanwhile, we should transition to talking about transmission by actual mechanisms: inhalation of aerosols, spray/impaction of large droplets, and touching contaminated surfaces, as suggested by Yuguo Li @don_milton and me. /11

          5 replies 46 retweets 237 likes
          Show this thread
        4. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

          These definitions better explain how the virus is actually transferred between people and correspond to different interventions, like high-performance masks and ventilation, distancing and face shields, hygiene and cleaning, respectively. /12

          3 replies 30 retweets 197 likes
          Show this thread
        5. Linsey Marr‏Verified account @linseymarr 1 Jun 2021

          Let's get to it, @WHO @DrTedros @doctorsoumya @mvankerkhove. We can end this pandemic more quickly and be better prepared next time around. /13

          9 replies 39 retweets 249 likes
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        6. End of conversation
        1. 4C Air‏ @4c_air 1 Jun 2021
          Replying to @linseymarr

          Thank you for this.

          0 replies 0 retweets 1 like
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        1. Paulo Pancho‏ @PauloEastvan 1 Jun 2021
          Replying to @linseymarr

          Really appreciate this. It accomplishes clear communication, better understanding for the public and also allows for better interdisciplinary cooperation going forward. Well done.

          0 replies 0 retweets 9 likes
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        1. Chelsea J masked and 3x vaxxed  👍‏ @chelseaj1221 2 Jun 2021
          Replying to @linseymarr @endocrine_witch

          So very much appreciative of your work. Now I'm waiting on @WHO and @CDCgov to recognize and acknowledge Dr. Li, Dr. Marr, Jose-Luis Jimenez, Tom Ewing, Katie Randall, and anyone else I missed on their team for their remarkable discoveries and work.https://www.wired.com/story/the-teeny-tiny-scientific-screwup-that-helped-covid-kill/ …

          0 replies 0 retweets 2 likes
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