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DanielleFong's profile
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@DanielleFong

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@DanielleFong

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Empire of the Future
Joined February 2008

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    1. Dr. Angela Rasmussen‏Verified account @angie_rasmussen 3 Feb 2021

      So where did this definition come from? Well, you need to have a definition of what close contact is in order to do contact tracing. ANY kind of contact, no matter how incidental, would multiply contacts to the point that tracing becomes impossible.

      3 replies 146 retweets 797 likes
      Show this thread
    2. Dr. Angela Rasmussen‏Verified account @angie_rasmussen 3 Feb 2021

      Let's say you go into a grocery store with 50 other people for 30 minutes. During that time, you run into someone you know and chat withing 6 feet for 15 minutes and then later find out you're positive for SARS-CoV-2.

      8 replies 109 retweets 609 likes
      Show this thread
    3. Dr. Angela Rasmussen‏Verified account @angie_rasmussen 3 Feb 2021

      Using this definition, contact tracers will call the person you chatted with. Let's say then you went to your 10-person office and were around 5 of your coworkers within 6 feet for a longer period of time. No problem, contact tracers call another 5 people.

      4 replies 86 retweets 552 likes
      Show this thread
    4. Dr. Angela Rasmussen‏Verified account @angie_rasmussen 3 Feb 2021

      Now let's say the definition of close contact is being ANY distance from people for ANY length of time. Suddenly contact tracers are calling 60 people. If transmission overall is low, that's still no problem. But that's not the situation in many places, including the US & Canada.

      6 replies 114 retweets 671 likes
      Show this thread
    5. Dr. Angela Rasmussen‏Verified account @angie_rasmussen 3 Feb 2021

      With hundreds or thousands of new COVID cases per day, this quickly becomes an insurmountable task just based on the numbers. With 100 cases/day in a community, this becomes 6000 contacts. With 1000 cases/day, it's 60,000. And contact tracing is more than just calling contacts.

      7 replies 108 retweets 661 likes
      Show this thread
    6. Dr. Angela Rasmussen‏Verified account @angie_rasmussen 3 Feb 2021

      So add to that the challenges in contact tracing: people don't always remember or know all their contacts or accurately recall where they were and when and for how long. Valid concerns about privacy may also make people reluctant to share this information.

      8 replies 74 retweets 564 likes
      Show this thread
    7. Dr. Angela Rasmussen‏Verified account @angie_rasmussen 3 Feb 2021

      So, it's not perfect, but close contact is defined to allow contact tracers to follow up on exposures that are most likely to lead to infection. Defining close contact for this purpose is NOT, however, a hard line over which transmission cannot occur.

      1 reply 209 retweets 957 likes
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    8. Dr. Angela Rasmussen‏Verified account @angie_rasmussen 3 Feb 2021

      Transmission is situational. If you are exposed to enough virus by the proper route, you can become infected. It can take less than 15 minutes to be exposed to enough virus. Depending on conditions, you can be exposed to an infectious dose over 6 feet away.

      13 replies 413 retweets 1,166 likes
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    9. Dr. Angela Rasmussen‏Verified account @angie_rasmussen 3 Feb 2021

      This is true for all viruses, not just SARS-CoV-2, and not just B.1.1.7 or other variants. So we should not regard definitions of contact for tracing to be the definition of exposure risk as we live our lives. The conflation of these two is one of many communication failures.

      5 replies 261 retweets 1,114 likes
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    10. Dr. Angela Rasmussen‏Verified account @angie_rasmussen 3 Feb 2021

      Now, with regard to B.1.1.7 being transmitted "faster", that's really hard to say. We only know that it's more transmissible, but not the mechanism. In other words, we don't know HOW it is more transmissible.

      6 replies 173 retweets 827 likes
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       🤷🏻‍♀️‏ @DanielleFong 3 Feb 2021
      Replying to @angie_rasmussen

      don’t we have evidence that there are literally an order of magnitude (or more) viral particles? isn’t that a mechanism?

      10:53 AM - 3 Feb 2021
      0 replies 0 retweets 0 likes

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