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firefoxx66's profile
Dr Emma Hodcroft
Dr Emma Hodcroft
Dr Emma Hodcroft
Verified account
@firefoxx66

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Dr Emma HodcroftVerified account

@firefoxx66

Die Virenjägerin! ☣️🏹🧬 Co-developer of @nextstrain at @ISPMBern @unibern! Using programming & phylogenetics, I study & track viruses. I like ✈️ & 🐈

Switzerland
ispm.unibe.ch/about_us/staff…
Joined March 2009

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    1. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

      In a third study, 1 family (A) from Wuhan infected two other fams (B & C) in an air-conditioned, windowless restaurant. The families overlapped by 50-70 mins in seating. 83 ppl in total ate lunch that day on this floor, over 15 tables. Only 5 in families B & C were infected 9/23

      2 replies 22 retweets 123 likes
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    2. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

      So overall attack rate is low - 6%. But within flow of the air-con unit (excluding A), a considerable 45%. A1 from family A developed symptoms 1st & is presumed to be index patient, but clearly infection of others in family A may not have been at restaurant. 10/23pic.twitter.com/wM4kgUvJxd

      3 replies 26 retweets 129 likes
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    3. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

      In this study, distances were smaller, & possibility of spread from others in Family A seemingly can't be ruled out, but the lack of infections in other nearby families (D, E, F) who are not in air-con flow lines is notable. 11/23

      3 replies 16 retweets 111 likes
      Show this thread
    4. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

      Clearly, other forms of transmission are also important. However, these studies make me concerned that groups in closed spaces with limited air flow could be a risk for #COVID19 #SARSCoV2 transmission. One that isn't covered by surface cleaning & 2m distance guidelines. 12/23

      9 replies 73 retweets 286 likes
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    5. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

      What do we know about airborne droplet spread? In speaking studies, smaller droplets (green) persist in air much longer than larger ones (red). These droplets could circulate considerably further than larger ones, which drop out of the air sooner. https://www.pnas.org/content/early/2020/05/12/2006874117 … 13/23pic.twitter.com/hWjVniAsUx

      5 replies 41 retweets 153 likes
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    6. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

      Importantly, however, as well as remaining airborne & having ability to circulate, infection potential of droplets is dependant on dehydration, saliva viral load & more. We don't yet understand how this all interplays to create a risk of infection by airborne droplets. 14/23

      3 replies 18 retweets 130 likes
      Show this thread
    7. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

      However, without understanding the science perfectly, I think we can still say this is a risk to be aware of. My concern is that while a lot of attention is going towards keeping 2m apart ↔️ & wiping doorknobs 🚪 & surfaces, little is focused on people in enclosed spaces. 15/23

      7 replies 72 retweets 306 likes
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    8. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

      Air circulation & filtration does seem to matter. The fact that we haven't seen large outbreaks linked to planes (even over longer flights) is interesting. Planes circulate & filter air frequently - so perhaps this can successfully prevent airborne transmission. ✈️💧🌬️ 16/23

      13 replies 60 retweets 317 likes
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    9. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

      Similarly, time likely matters. All of the above situations were >=50mins of exposure. Places like grocery stores, where trips are shorter & air flow likely aided by people coming & going (plus usual ventilation) are probably much lower risk. ⏲️💧🛒 17/23

      3 replies 33 retweets 212 likes
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    10. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

      What we remain unsure about are other forms of transport with less 'air attention': trains 🚅, busses 🚍, trams 🚋. And busy, longer-visit enclosed spaces: restaurants 🍽️, offices 💻, gyms 🏋️🏻, waiting areas ⚕️. 18/23

      9 replies 35 retweets 203 likes
      Show this thread
      Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

      What can we do to reduce airborne #COVID19 risk? Advice is likely to differ while we're uncertain. But some things might help: - Prioritise outdoor restaurant seating 🌞 - Open windows as much as when possible 🪟 - Mask-wearing😷 - Reduce overall inside capacity 👩‍👩‍👧‍👦 19/23

      5:13 AM - 14 May 2020
      • 124 Retweets
      • 410 Likes
      • Dirk's Diafragma deceEU Ruth J erdinc uslu 💨💧🌡️🕸️HEPA Filtre / 🚦CO2 Ölçümü Murray W Roth Prism Doug kidaba Ian Orr
      15 replies 124 retweets 410 likes
        1. New conversation
        2. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

          If concerns about airborne transmission bear out, changes to air circulation systems/flows/patterns & filter qualities may make places safer. In the short term, advice on masks & doing all possible to aid air exchange with the outside may make a real difference. 20/23

          5 replies 38 retweets 201 likes
          Show this thread
        3. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

          The fact that it feels like this is something less easy to tackle (not simply putting 2m lines on a floor, or sanitising table-tops) makes it harder to talk about, I think. We don't want to have more to be worried about! 😫 21/23

          5 replies 26 retweets 187 likes
          Show this thread
        4. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

          But wishing won't make a possible risk go away. ✨🤞🏻 Instead, we should empower our reopening strategies to take into consideration these possible risks, & let people take put into their calculations about where & when they go. So they can make informed decisions. 🧮 22/23

          2 replies 32 retweets 220 likes
          Show this thread
        5. Dr Emma Hodcroft‏Verified account @firefoxx66 14 May 2020

          Re-opening & exit strategies are about risk calculation. It's important we consider all ways we can reduce transmission potential - including airborne #COVID19 #SARSCoV2 transmission. We learn more every day through hard-working research - this will guide us on each step! 23/23

          46 replies 45 retweets 298 likes
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        6. End of conversation
        1. Simon Hofmann‏ @keysar007 14 May 2020
          Replying to @firefoxx66

          Thx. Interesting thread. I will tell this my local gym right away. Been there yesterday. Sticky air. All windows closed.

          1 reply 0 retweets 2 likes
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        1. New conversation
        2. Eric Christiansen‏ @charliechris 14 May 2020
          Replying to @firefoxx66

          Is there any evidence to suggest indoor/room HEPA air filters reduce the risk of transmission?

          1 reply 0 retweets 3 likes
        3. Angela King - Public Health & Philosophy‏ @mastweiler8 14 May 2020
          Replying to @charliechris @firefoxx66

          HEPA filters are designed to filter out virus particles this small, so in theory they should work. Here's an article about it.https://www.consumerreports.org/air-purifiers/what-to-know-about-air-purifiers-and-coronavirus/ …

          0 replies 0 retweets 2 likes
        4. End of conversation
        1. અક્ષય‏ @iAK011 14 May 2020
          Replying to @firefoxx66 @nataliexdean

          Stop indoor activities with brutally hot summer and monsoon rains. What BS recommendations, continues pseudo-science 'no knowing' epidemiologists/virologists. It will take 10 years to understand SARS-2 even then they will know nothing, zero skin in the game.

          0 replies 0 retweets 1 like
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        1. jmptahoe‏ @runontrail 14 May 2020
          Replying to @firefoxx66 @nataliexdean

          Indoor environment + lots of people + exposure for more than 30 minutes = no thanks If I have a choice I can wait

          0 replies 1 retweet 5 likes
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        1. Cgsg52008‏ @cgsg52008 14 May 2020
          Replying to @firefoxx66

          @ochealth

          0 replies 0 retweets 0 likes
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