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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 21 Oct 2020

      Health Nerd Retweeted Health Nerd

      Worth noting that this represents 607,559 COVID-19 tests with 226 positives, giving a positive rate of 0.0372% Even if EVERY TEST was a false positive, that gives a specificity of ~99.96%https://twitter.com/GidMK/status/1319084436630073344 …

      Health Nerd added,

      Health NerdVerified account @GidMK
      For some context on this amazing effort, here is the % positive of tests run for COVID-19 in NSW since 1/09 Less than 0.2% the entire time! Spectacular work @NSWHealth https://twitter.com/GregDore2/status/1319080516264415232 … pic.twitter.com/tTIeYyJuQM
      12 replies 52 retweets 162 likes
      Show this thread
    2. Dr. Swapneil Parikh 💉 💉 😷‏Verified account @swapneilparikh 22 Oct 2020
      Replying to @GidMK

      False positives are very uncommon but a person can be reported positive without being infected due to contamination in the lab. This is a true positive for the test but an erroneous result for the patient. Contamination is more likely if there are many positive samples in the lab

      1 reply 0 retweets 1 like
      Health Nerd‏Verified account @GidMK 22 Oct 2020
      Replying to @swapneilparikh

      That's a complete non-sequitur. It makes no difference. Even if it was true for every sample in NSW, it would still only be happening once every 100,000 tests or so

      7:56 AM - 22 Oct 2020
      • 6 Likes
      • Josiah Grindrod Jaime van Kessel blaaaa Cherise Rohr Allegrini, PhD, MPH Johnny Rhee🔴
      1 reply 0 retweets 6 likes
        1. New conversation
        2. Dr. Swapneil Parikh 💉 💉 😷‏Verified account @swapneilparikh 22 Oct 2020
          Replying to @GidMK

          I agree with you! Let’s say a lab in NSW processes 1000 samples per day with a positivity rate of 0.1%. A lab in Florida processes 2000 samples a day with a positivity rate of 50%. The risk of contamination would be much higher in the busier Florida lab with more positive samples

          1 reply 0 retweets 1 like
        3. Dr. Swapneil Parikh 💉 💉 😷‏Verified account @swapneilparikh 22 Oct 2020
          Replying to @swapneilparikh @GidMK

          To clarify, even with contamination the chance of a non infected person getting a +ve result is small. I was just suggesting you can’t compare the figures from NSW (low community transmission) with areas with high transmission because of increased risk of contamination there.

          0 replies 0 retweets 2 likes
        4. End of conversation

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