Discover and read the best of Twitter Threads about #serology

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Thoughts on upcoming #COVID19 #serology tests:
This is actually quite a challenge! (#Diagnostics often involve a lot of complexities). There is a lot of pressure to roll these tests out, but they need to perform well, or we do more harm than good. #MicroRounds (A thread)
WHY we need these soon:
1. Contact tracing.
2. Can be used to test if a vaccine is working during a clinical trial (70 of them ongoing right now, I believe)
3. Inform public policy makers about rate of asymptomatic cases + previous infections/exposures =informed decision making
How is developing a #PCR different than developing a #serology test?
1. #PCR tests detect viral RNA/DNA (in this case RNA) and can be pretty straight-forward in terms of development
2. #Serology relies on knowing about the #SARSCoV2 structure and how the human body responds.
Read 13 tweets
I want to separately pull out this graphic from the @ASMicrobiology #COVID19 #testing paper since I think it’s *super* helpful. #RNA tests tell us if you’re infected right now (mostly, see next tweet). #Serology tells us if you were recently(ish) infected.
1st important point. RNA tests can pick up any viral RNA, whether that’s live infectious virus or garbage RNA still in your body. Also the sample might not capture RNA (say the virus is in your GI not your nose & we sample your nose). This can give false negatives.
2nd point. Serology doesn’t typically make for good rapid tests, since your body needs time to make antibodies. You don’t magically make them as soon as you see a pathogen, it takes a few days for the machinery to get warmed up and going (think like a factory).
Read 5 tweets

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