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GidMK's profile
Health Nerd
Health Nerd
Health Nerd
Verified account
@GidMK

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Health NerdVerified account

@GidMK

Epidemiologist. Writer (Guardian, Observer etc). "Well known research trouble-maker". PhDing at @UoW Host of @senscipod Email gidmk.healthnerd@gmail.com he/him

Sydney, New South Wales
theguardian.com/profile/gideon…
Joined November 2015

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    1. Health Nerd‏Verified account @GidMK 15 Oct 2020

      Something that I think is worth explaining: The term "herd immunity" has a few different meanings, all of which are quite precise. This is an important pointpic.twitter.com/PBnK4J6ntD

      5 replies 33 retweets 95 likes
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    2. Health Nerd‏Verified account @GidMK 15 Oct 2020

      In a very strict mathematical sense, herd immunity is the slowing of disease spread due to sufficient infected people in a population (such that Rt<1)

      1 reply 3 retweets 16 likes
      Show this thread
    3. Health Nerd‏Verified account @GidMK 15 Oct 2020

      This leads to the second definition, which is the ability to calculate immunity within a population based on dynamics of disease spread

      1 reply 3 retweets 11 likes
      Show this thread
      Health Nerd‏Verified account @GidMK 15 Oct 2020

      And finally, the common usage that's being bandied around a lot these days - herd immunity to describe a population which is largely immune to outbreaks of an infectious disease due to existing population immunity

      4:43 PM - 15 Oct 2020
      • 3 Retweets
      • 9 Likes
      • Dr Steve Moss 👨‍👩‍👧‍👦👨‍🎓👨‍🔬👨‍💻👨‍🏫🧐💙 Omar Pinedo G. C. A. Ryan Armstrong Thatcher Ulrich Carly Christina design BEEFCAKE!!!
      1 reply 3 retweets 9 likes
        1. New conversation
        2. Health Nerd‏Verified account @GidMK 15 Oct 2020

          Problem is, all three of these are being combined into a single idea in the popular media, which is not great because only definition 3 results in a somewhat permanent ending to the pandemic

          2 replies 3 retweets 14 likes
          Show this thread
        3. Health Nerd‏Verified account @GidMK 15 Oct 2020

          The #GreatBarringtonDeclaration, for example, uses the first definition in a very disingenuous way to imply that endemic transmission of the disease (where Rt may at some points be <1) is equivalent to population immunity that prevents outbreaks

          1 reply 5 retweets 16 likes
          Show this thread
        4. Health Nerd‏Verified account @GidMK 15 Oct 2020

          If someone uses the term "herd immunity" to describe an actual strategy or outcome from COVID-19, it's worth digging in to EXACTLY what they mean by that term, because often it's very much not what you'd imagine

          2 replies 5 retweets 17 likes
          Show this thread
        5. Health Nerd‏Verified account @GidMK 15 Oct 2020

          And if you're interested in reading more, this article is a great place to start:https://academic.oup.com/cid/article/52/7/911/299077 …

          1 reply 6 retweets 26 likes
          Show this thread
        6. Health Nerd‏Verified account @GidMK 15 Oct 2020

          Also, I made an error in the second tweet - in a strict mathematical sense, herd immunity is having sufficient people IMMUNE to the disease in a population. Infection does not always confer immunity, and you can be immune without infection (vaccines!)

          1 reply 5 retweets 21 likes
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        7. End of conversation

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