SARS-CoV-2 testing

Covid-19 discussion, bring your own statistics
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Catbabel
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Re: SARS-CoV-2 testing

Post by headshot » Wed Dec 22, 2021 9:39 am

Classic…

Their new 7-day test and release guidance directly contravenes the guidance on the NHS website.
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shpalman
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Re: SARS-CoV-2 testing

Post by shpalman » Wed Dec 22, 2021 9:46 am

That says to not do a PCR test.* The Guardian says you can get the all-clear from a lateral flow test.
From Wednesday, new guidance will enable the 10-day self-isolation period for vaccinated and unvaccinated people in England who have tested positive for coronavirus to be reduced by three days if they get the all-clear from lateral flow tests.
* - possibly because the PCR test is sensitive and can also pick up fragments of virus which your immune system has killed and your body is getting rid of.
molto tricky

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Gfamily
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Re: SARS-CoV-2 testing

Post by Gfamily » Wed Dec 22, 2021 9:52 am

headshot wrote:
Wed Dec 22, 2021 8:37 am
Covid self-isolation cut to seven days with negative test in England
Public health bosses say move for those who test negative on days six and seven will help support essential services


But strangely, my friend who has Covid and was supposed to be isolateing until the 24th just said this:
… they told me not to bother doing a PCR or lateral flow for 90 days as the results can be flawed
So should Covid+ people get tested or not??
For a long time they've said not to use a PCR within 90 days of an infection, though you can use LFD tests. PCR tests are more sensitive and can pick up traces of previous infections for longer.

I thought a negative LFT result was supposed to be indicative of being clear of a current infection.

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Catbabel
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Re: SARS-CoV-2 testing

Post by headshot » Wed Dec 22, 2021 10:24 am

Ah fair enough.

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shpalman
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Re: SARS-CoV-2 testing

Post by shpalman » Fri Dec 31, 2021 4:11 pm

Did we never link to Rethinking Covid-19 Test Sensitivity — A Strategy for Containment? It's over a year old now but it's the source of the graph in this tweet even if it doesn't explicitly calibrate its time axis.
molto tricky

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Bird on a Fire
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Re: SARS-CoV-2 testing

Post by Bird on a Fire » Fri Dec 31, 2021 4:20 pm

It's a bit quicker with Omi though, Shirley?
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shpalman
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Re: SARS-CoV-2 testing

Post by shpalman » Fri Dec 31, 2021 4:44 pm

Bird on a Fire wrote:
Fri Dec 31, 2021 4:20 pm
It's a bit quicker with Omi though, Shirley?
Basically the idea of having a PCR from the previous 48-72 hours is a bit useless compared to doing a rapid test right when you need to know.
molto tricky

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jimbob
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Re: SARS-CoV-2 testing

Post by jimbob » Fri Dec 31, 2021 5:06 pm

shpalman wrote:
Fri Dec 31, 2021 4:11 pm
Did we never link to Rethinking Covid-19 Test Sensitivity — A Strategy for Containment? It's over a year old now but it's the source of the graph in this tweet even if it doesn't explicitly calibrate its time axis.
https://www.sheffield.ac.uk/news/univer ... covid-test


Which links to a very similar diagram but no papers that I can see

https://www.paraytec.com/covid-19-test/
Have you considered stupidity as an explanation

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shpalman
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Re: SARS-CoV-2 testing

Post by shpalman » Mon Jan 03, 2022 6:37 pm

molto tricky

raven
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Re: SARS-CoV-2 testing

Post by raven » Mon Jan 03, 2022 10:12 pm

To be fair, if the community pharmacies they're supplying are anything like our local chemist they'll all have been closed for those 4 days too, so there wouldn't have been anywhere open to deliver kits to.

(You could probably make a case for them shutting for a shorter time, but that would require acknowledging we're in some sort of emergency situation. Not sticking your head in the sand & pretending everything is just going to magically turn out fine.....)

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