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richdavisphd's profile
Rich Davis, PhD, D(ABMM), MLS 🦠🔬🧫
Rich Davis, PhD, D(ABMM), MLS 🦠🔬🧫
Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫
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@richdavisphd

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Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫Verified account

@richdavisphd

Clinical Microbiology Lab Director, Providence Sacred Heart Daily micro pics: #MicroRounds #ASCP40UnderForty 2020 Honoree Tweets/opinions are my own, he/him

Spokane, WA
Joined March 2010

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    1. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

      What does a mask do? Blocks respiratory droplets coming from your mouth and throat. Two simple demos: First, I sneezed, sang, talked & coughed toward an agar culture plate with or without a mask. Bacteria colonies show where droplets landed. A mask blocks virtually all of them.pic.twitter.com/ETUD9DFmgU

      Providence Eastern WA  😷
      2,708 replies 186,934 retweets 329,309 likes
      Show this thread
      Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

      What about keeping your distance? Second demo: I set open bacteria culture plates 2, 4 and 6 feet away and coughed (hard) for ~15s. I repeated this without a mask. As seen by number of bacteria colonies, droplets mostly landed <6 ft, but a mask blocked nearly all of them.pic.twitter.com/8wDdvIHHMa

      2:32 PM - 26 Jun 2020
      • 12,197 Retweets
      • 26,765 Likes
      • Cantona109 Rohitkhajuria Chris Los Feos Somos Más ... (@_@)--»Mai Blair Duff 🌊😷 Hoping for Normal-SEA 🍻 Semicolon Mr Qr Cem Cakir
      185 replies 12,197 retweets 26,765 likes
        1. New conversation
        2. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          I'm aware that this simple (n=1) demo isn't how you culture viruses or model spread of SARS-CoV-2. But colonies of normal bacteria from my mouth/throat show the spread of large respiratory droplets, like the kind we think mostly spread #COVID19, and how a mask can block them!pic.twitter.com/16azsiIbZd

          Providence Eastern WA  😷
          105 replies 5,511 retweets 15,588 likes
          Show this thread
        3. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted Providence Eastern WA  😷

          My mask vs. no mask demonstrations got perfectly summarized in this brief 34 second video. Masks keep your respiratory secretions to yourself! @providence_phchttps://twitter.com/providence_phc/status/1276619220957233154?s=20 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          0:34
          Providence Eastern WA  😷 @providence_phc
          It's amazing how much good one little mask can do! Check out how a normal, everyday mask keeps respiratory droplets from spreading outside your body, potentially sharing viruses. pic.twitter.com/zeXyemJwO8
          57 replies 2,885 retweets 7,697 likes
          Show this thread
        4. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted Kevin Ko

          Something extra cool, local reporter Kevin Kim came to our teaching lab and tried this same demonstration himself (his reaction in this clip was absolutely genuine). Story airs tonight @KHQLocalNews The take home: masks matter!https://twitter.com/NewsWithKevin/status/1276605461819580416?s=20 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          0:10
          Kevin Ko @NewsWithKevin
          Exclusive: How effective is a mask? We headed to @providence_phc's lab with @richdavisphd to find out. I did the following with and without a mask: talk, sing, cough, and sneeze. We just got the results today. Full story airs tonight at 6 on @KHQLocalNews. pic.twitter.com/I32VhXXEfF
          Show this thread
          13 replies 1,004 retweets 4,242 likes
          Show this thread
        5. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Masks as a political/social litmus test or used to shame those who won't (or disabled folks who truly can't!) wear them is a travesty. We wash hands after using the bathroom & wipe noses on tissues. Masks/face shields need to be just another normalized act of hygiene. #MasksWork

          70 replies 1,022 retweets 5,293 likes
          Show this thread
        6. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Well I just got back from reading some slides in the lab and this has completely overwhelmed my ability to keep up with comments and questions. Wow. I'll circle back later tonight to answer questions. Thanks everyone!

          20 replies 213 retweets 2,389 likes
          Show this thread
        7. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted Shelby Hintze

          I saw a number of people ask this: how did I sneeze on command? I actually got a packet of pepper from the cafeteria to try to make myself sneeze - didn't work, just got watery eyes. So I just did a fake stage-sneeze at the plate.https://twitter.com/ShelbyHintze/status/1276632641136025600?s=20 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          Shelby Hintze @ShelbyHintze
          Replying to @richdavisphd @madpetersen @providence_phc
          OK but how did you make yourself sneeze? 😂😂😂
          41 replies 201 retweets 2,352 likes
          Show this thread
        8. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted EBabady, PhD

          When reporter @NewsWithKevin did this experiment, he sang twice. Once he sang Smashmouth's "All Star" and on a different plate rapped Tupac's "Things Will Never Change." The Tupac plate had more bacteria. Literally spitting verses ...https://twitter.com/EBabady/status/1276649843646181377?s=20 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          EBabady, PhD @EBabady
          Replying to @richdavisphd @providence_phc
          Did the choice of song impact the results 😉?! Nice demo!
          16 replies 307 retweets 3,033 likes
          Show this thread
        9. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          The clip from tonight's @KHQLocalNews with reporter Kevin Kim repeating this experiment (and reacting to the results) is here. I think this turned out really well! Awesome job Kevin! @NewsWithKevin @providence_phchttps://www.khq.com/news/khq-investigates-how-effective-is-a-mask/video_e308a1e8-b74f-11ea-ac6d-878bd6f54032.html …

          4 replies 241 retweets 1,515 likes
          Show this thread
        10. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted

          A lot of people asked this: "could you do this with ___ type of mask?" (homemade, single layer, cotton, N95 etc.) So it's not a bad idea but I would honestly expect the outcome of THIS demonstration to be essentially the same and here's why... https://twitter.com/argyleumbrella/status/1276702335599697921?s=20 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          This Tweet is unavailable.
          11 replies 182 retweets 1,488 likes
          Show this thread
        11. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          I try to be really clear what this does & does not show. DOES SHOW: the act of talking (or coughing, sneezing, singing) causes particles of liquid to come out of your mouth. DOES SHOW: those droplets can carry microbes like bacteria DOES SHOW: a mask blocks most of those

          7 replies 315 retweets 2,039 likes
          Show this thread
        12. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          DOES NOT SHOW: what is the number, size, and distribution of respiratory droplets produced by coughing/talking etc. DOES NOT SHOW: could these droplets carry viruses (like SARS-CoV-2), does a mask block THOSE (Based on what we know you can intuit/infer this, but it's not shown)

          10 replies 261 retweets 1,878 likes
          Show this thread
        13. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Something I repeated enough while talking that reporter Kevin finally asked, "Why do you keep calling it a 'demonstration' and not an 'experiment'?" To me this is purely a demonstration bc 1) it was just one single data point and 2) I essentially knew the outcome going in

          5 replies 160 retweets 1,863 likes
          Show this thread
        14. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          I *knew* that coughing on a agar plate would get my mouth bacteria on there and I knew that a mask would decrease that amount (maybe even completely). I used a surgical mask from a hospital. Would a homemade mask do the same and keep mouth bacteria from the plates? Certainly.

          7 replies 163 retweets 1,498 likes
          Show this thread
        15. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          If I was trying to compare the ability of - disposable paper mask - hospital surgical mask - homemade fabric mask - N95 mask - PAPR to reduce virus transmission, I wouldn't do what I did here, which is see how well a mask blocks minute bits of spit using # of bacteria as a proxy

          8 replies 148 retweets 1,351 likes
          Show this thread
        16. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          So COULD you test different masks with this same set up? Yes. Would it be different? Eh. Probably not. A mask preventing your spit & breath from flying out of your mouth, even if doesn't catch it all, will stop some spread of bacteria (see here) AND LIKELY VIRUS (not seen here)

          16 replies 161 retweets 1,357 likes
          Show this thread
        17. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted felinecannonball  😷

          OK here's what was probably the most common question I saw: what did I sing at (to??) my culture plates. It was "Dear Theodosia" from Hamilton, top of my lungs. If I could have anyone's singing talent it would be Leslie Odom Jr.'s. (Spoiler: I don't.)https://twitter.com/feline_cannon/status/1276653662073319424?s=20 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          felinecannonball  😷 @feline_cannon
          Replying to @richdavisphd @bjhomer @providence_phc
          What did you sing?
          16 replies 120 retweets 1,843 likes
          Show this thread
        18. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted T C

          100% true: bacteria are incredibly different from viruses! But since we expect respiratory droplets to be what primarily spreads #COVID19, I exploit the presence of (easily to grow and visualize) bacteria in respiratory droplets, to show where they go.https://twitter.com/curlfw/status/1276710062807871488?s=20 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          T C @curlfw
          Replying to @richdavisphd @codinghorror @providence_phc
          good experiment, but virus != bacteria
          8 replies 218 retweets 1,590 likes
          Show this thread
        19. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted Lindsay Goldwert

          "Microbiology in six words or less..."https://twitter.com/lindsaygoldwert/status/1276730396575707136?s=20 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          Lindsay Goldwert @lindsaygoldwert
          Replying to @richdavisphd @providence_phc
          This is so gross and cool
          6 replies 198 retweets 2,258 likes
          Show this thread
        20. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          It’s Friday night and a bunch of nice people are recommending I pull out my nose hair. Things are ver normal and good ... 😅pic.twitter.com/BLDtN7cLPw

          9 replies 58 retweets 987 likes
          Show this thread
        21. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted Jeremy Michelson

          You certainly COULD do this. But I was not be trying to quantitate # of droplets/bacteria colonies spread by diff. behaviors or exactly how far. More sophisticated techniques than this show droplet spread by just breathing...https://twitter.com/JeremyMichelson/status/1276656755959754752?s=20 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          Jeremy Michelson @JeremyMichelson
          Replying to @richdavisphd
          Can you repeat the distance experiment with speaking and singing as well? It would be interesting to know if those spread droplets further or less far than coughing.
          4 replies 71 retweets 772 likes
          Show this thread
        22. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          It's a fun idea testing distance of droplets spread by talking, breathing, singing etc. (what about diff. types of songs? Trained or professional singer?) Would it "prove" that singing can really spread droplets? I think we already know that's the case:https://www.cnn.com/2020/05/13/us/coronavirus-washington-choir-outbreak-trnd/index.html …

          11 replies 204 retweets 1,028 likes
          Show this thread
        23. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted The French Resident

          This could be a fun thing you could do. However, I don't think it would model protection to the mask weaver very well (at least with this simple experiment design....)https://twitter.com/InternFrench/status/1276709773673668611?s=20 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          The French Resident @InternFrench
          Replying to @richdavisphd
          Did you try covering the plates with a mask? To compare wearing a mask for oneself vs to protect the others
          4 replies 66 retweets 722 likes
          Show this thread
        24. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Inhaling is an active, high-velocity process, just like exhaling, coughing, and sneezing are. A mask sitting on top of a plate will certainly block any droplets that come flying at it. But a person breathing in droplets coughed out by another person? Different story.

          7 replies 90 retweets 814 likes
          Show this thread
        25. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted People's Daily, China

          Unless it's a fit-tested respirator, your surgical or cloth mask won't have an air tight seal. When you inhale, if air finds the path of least resistance, a lot will go in on the sides... (video from LaVision showing air currents w/ and w/o a man's N95)https://twitter.com/PDChina/status/1247167174453506048?s=20 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          0:20
          People's Daily, ChinaVerified account @PDChina
          The role of mask: comparison of airflow when people wearing and not wearing mask talk and cough. (video: LaVision) pic.twitter.com/iDfKMUDslW
          19 replies 323 retweets 1,314 likes
          Show this thread
        26. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 26 Jun 2020

          Someone (sorry I can't find who) asked, could I try to catch droplets coming out the SIDE of a surgical mask. I don't think a bacteria plate-based readout would answer the real question which is "where do THOSE exhalations/droplets go?" I don't know but it won't be out in front.

          10 replies 72 retweets 690 likes
          Show this thread
        27. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 27 Jun 2020

          Well this has been like nothing I could've expected. There are replies to a few often-repeated questions in the above thread but a lot of these keep getting re-asked. If you've asked something new, chances are good I'll miss it because, yikes, this got pretty big.

          7 replies 57 retweets 732 likes
          Show this thread
        28. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 27 Jun 2020

          It's been really great interacting with people, seeing other language translations and so many good questions and comments. Overwhelmingly I've only seen positive responses so thanks for that. Going to get some rest. Thanks! #Masks4All #FaceShieldsForAll

          61 replies 81 retweets 1,220 likes
          Show this thread
        29. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 29 Jun 2020

          It's now three days later and things are still going pretty strong. Going to add to this thread a few additional ideas, reminders and answers. Away we go!

          4 replies 16 retweets 186 likes
          Show this thread
        30. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 29 Jun 2020

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 Retweeted Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫

          I think most of the questions/criticisms I've seen are things that I believe I already addressed enough, but I can circle back on some of them: "Bacteria =/= viruses!!" Yes, but large droplets that can carry/deposit both get blocked by masks.https://twitter.com/richdavisphd/status/1276629366789697536 …

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫 added,

          Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫Verified account @richdavisphd
          I'm aware that this simple (n=1) demo isn't how you culture viruses or model spread of SARS-CoV-2. But colonies of normal bacteria from my mouth/throat show the spread of large respiratory droplets, like the kind we think mostly spread #COVID19, and how a mask can block them! pic.twitter.com/16azsiIbZd
          Show this thread
          9 replies 42 retweets 235 likes
          Show this thread
        31. Rich Davis, PhD, D(ABMM), MLS  🦠 🔬 🧫‏Verified account @richdavisphd 29 Jun 2020

          Not only *can* large droplets carry viruses, but it’s thought that this is the primary way #COVID19 is spread. Therefore, blocking those droplets? A primary way of preventing that spread. This @STATnews article (from March!) covers lot of that ground https://www.statnews.com/2020/03/16/coronavirus-can-become-aerosol-doesnt-mean-doomed/#:~:text=The%20reason%20the%20measles%20is,exist%20as%20a%20true%20aerosol ….

          3 replies 34 retweets 148 likes
          Show this thread
        32. Show replies

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