Questions tagged [pcr]

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1answer
57 views

Do presymptomatic people test PCR-positive

I know that RT-PCR testing can detect coronavirus in symptomatic and asymptomatic carriers. I was wondering whether a presymptomatic carrier (I don't know if the terminology is correct, but I mean ...
1
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0answers
29 views

Who's RNA does the rRT-PCR test for SARS-CoV-2 target?

The official guide for laboratory testing for coronavirus disease in suspected human cases by the WHO explains the procedure for testing a sample. On page two it states that the test is based on ...
2
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1answer
82 views

False Positive PCR - COVID-19 and possible reinfection when antibodies value is +7.0

A friend of mine was detected COVID-19 positive through PCR one month back. He was asymptotic as per doctors and had no symptoms. He quarantined himself and increased his intake of water. After 1 ...
5
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2answers
116 views

Has China announced any results from their massive (new) COVID-19 testing program in Wuhan?

About 10 days ago China announced a plan to test the entire population (~11 million) of Wuhan. And more recently they've announced testing over 1 million per day in the city. But have any results been ...
1
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1answer
42 views

Why does CDC's RT-PCR protocol for Covid-19 use the N gene, but the Charite one the E gene and RdRp?

The Charite protocol mentioned among other things that Of note, the N gene assay also performed well but was not subjected to intensive further validation because it was slightly less sensitive. ...
2
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1answer
31 views

How often is a Ct of 30 (or more) using the Charité protocol a false positive for Covid-19?

A French case report that has received widespread media attention suggests (actually stated in pretty strong terms in the paper) that Covid-19 was already spreading in France in December 2019. (In ...
0
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0answers
21 views

Are there devices for measuring the quantity of Covid-19 (RNA) in the air?

I would like to know if there are some devices that can measure the quantity of Covid-19 in the air that a human being would inhale while walking on the streets, shopping in stores and coming back ...
1
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1answer
83 views

Having tested positive for COVID-19, will future tests be positive?

The World Health Organization indicates the COVID-19 genome is detected in assays. Once a patient tests positive, is there any reason not to expect that future instances of the same assay will result ...
6
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1answer
110 views

How do they test COVID-19 in drive-thru labs?

I've read that SARS-CoV-2 virus which causes COVID-19 disease can be tested with RT-qPCR.[1] It seems a somewhat lengthy procedure. Then it's unclear to me: how do they test the virus in drive-...