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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 5 Mar 2020

      Let's talk about #airborne transmission of #SARSCOV2 and other viruses. A discussion is needed to improve accuracy and reduce fear associated with the term. /1

      217 replies 952 retweets 2,444 likes
      Show this thread
    2. Linsey Marr‏Verified account @linseymarr 5 Mar 2020

      The virus can be released into the air through coughing, sneezing, talking, and breathing. Some people release more than others. /2

      11 replies 68 retweets 448 likes
      Show this thread
    3. Linsey Marr‏Verified account @linseymarr 5 Mar 2020

      The virus is in droplets that range in size from smaller than we can see to large ones that fall to the floor quickly. There is no hard cutoff between "aerosols" and "droplets". /3

      6 replies 59 retweets 457 likes
      Show this thread
    4. Linsey Marr‏Verified account @linseymarr 5 Mar 2020

      At close range (imagine a breath cloud on a cold day), the concentration of airborne virus will be quite high. As you get farther from the source, the concentration falls off rapidly. /4pic.twitter.com/Ubwp5qAdJc

      8 replies 87 retweets 444 likes
      Show this thread
    5. Linsey Marr‏Verified account @linseymarr 5 Mar 2020

      If you are close, you are much more likely to inhale the virus. You are also more likely to be sprayed by large droplets that land on your face, which doesn't happen if you're farther away. /5

      5 replies 55 retweets 366 likes
      Show this thread
      Linsey Marr‏Verified account @linseymarr 5 Mar 2020

      Viruses in small droplets can float around in air for many hours, but they will likely be quite diluted unless you're in a small confined space. You could inhale these, but it's much less likely than if you're close to the person. /6

      10:59 AM - 5 Mar 2020
      • 70 Retweets
      • 449 Likes
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      15 replies 70 retweets 449 likes
        1. New conversation
        2. Linsey Marr‏Verified account @linseymarr 5 Mar 2020

          Airborne viruses will eventually settle on surfaces, like the floor and tables, and could be picked up if someone touches them. However, their ability to survive varies with temperature, humidity, and surface material. /7

          6 replies 55 retweets 370 likes
          Show this thread
        3. Linsey Marr‏Verified account @linseymarr 9 Mar 2020

          They decay gradually over hours or days. It's not like they all stick around for 9 days and then, poof, suddenly disappear. Think of them as fading away. /8

          7 replies 48 retweets 369 likes
          Show this thread
        4. Linsey Marr‏Verified account @linseymarr 19 Mar 2020

          I should have used cigarette smoke as a better analogy than a breath cloud because smoke has particles that stick around and fall onto surfaces. Tiny water droplets in a breath cloud eventually evaporate into the gas phase. /9

          34 replies 56 retweets 447 likes
          Show this thread
        5. End of conversation
        1. New conversation
        2. Siyuan Wang 王思源‏ @SiyuanWang_PhD 6 Mar 2020
          Replying to @linseymarr

          I think I read from somewhere that sneeze droplets can be up to mm in diameter but may shrink to a few microns when dried. Surgical masks have a filtration efficiency of >50-60% for particles larger than 1 micron. So surgical masks should help, does it make sense? Thank you

          1 reply 0 retweets 0 likes
        3. Linsey Marr‏Verified account @linseymarr 7 Mar 2020
          Replying to @SiyuanWang_PhD

          Yes, droplets evaporate to much smaller sizes. Surgical masks are designed to keep the wearer from spreading "germs." They may help reduce the wearer's exposure, but they would need to be tight with no gaps.

          2 replies 2 retweets 13 likes
        4. Show replies
        1. mlb 5645654‏ @M5645654 15 Mar 2020
          Replying to @linseymarr

          I live in a highrise apt in NYC and take an elevator all the time. is it easy for you to get the Coronavirus in an elevator? thank you in advance for your reply

          0 replies 0 retweets 0 likes
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        2. Tara Haelle‏Verified account @tarahaelle 19 Apr 2020
          Replying to @linseymarr

          Can you point to the evidence that SARS-CoV2 virus participles float around in the air for many hours? I haven’t been able to find any studies showing or suggesting this.

          1 reply 0 retweets 1 like
        3. Ska Stapp‏ @Easy_Chowder 8 May 2021
          Replying to @tarahaelle

          it’s been over a year now, find any evidence?

          1 reply 0 retweets 2 likes
        4. Show replies
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        2. Richard *𝐏𝐚𝐲 𝐂𝐨𝐫𝐫𝐞𝐚* Maxton‏ @LastSon76 8 May 2021
          Replying to @BearnairdineBee @linseymarr

          You're not accounting for filtration and the air being refreshed (not re-cycled) every few minutes in airplane cabins.

          0 replies 0 retweets 3 likes
        3. End of conversation

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