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Re: SARS-CoV-2 testing

Posted: Wed Dec 22, 2021 9:39 am
by headshot
Classic…

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

Posted: Wed Dec 22, 2021 9:46 am
by shpalman
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.

Re: SARS-CoV-2 testing

Posted: Wed Dec 22, 2021 9:52 am
by Gfamily
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.

Ninja'd

Re: SARS-CoV-2 testing

Posted: Wed Dec 22, 2021 10:24 am
by headshot
Ah fair enough.

Re: SARS-CoV-2 testing

Posted: Fri Dec 31, 2021 4:11 pm
by shpalman
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.

Re: SARS-CoV-2 testing

Posted: Fri Dec 31, 2021 4:20 pm
by Bird on a Fire
It's a bit quicker with Omi though, Shirley?

Re: SARS-CoV-2 testing

Posted: Fri Dec 31, 2021 4:44 pm
by shpalman
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.

Re: SARS-CoV-2 testing

Posted: Fri Dec 31, 2021 5:06 pm
by jimbob
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/

Re: SARS-CoV-2 testing

Posted: Mon Jan 03, 2022 6:37 pm
by shpalman

Re: SARS-CoV-2 testing

Posted: Mon Jan 03, 2022 10:12 pm
by raven
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.....)