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Spanish capital ditches ‘unreliable’ Chinese coronavirus test kits

If it is the fault of the manufacturing company, leave the manufacturing company accountable. One should not equate the nation with a separate corporation. Anyway, if this is true, then anti-china is a good reason to attack China. There is no need to waste time trying to change their perspective. It is impossible
 
This kinds of rapid testing kits from various countries work the same way

‘10-minute diagnostic tests not recommended due to inaccuracy’
  • By Song Soo-youn
  • Published 2020.03.19 15:49
As the world is grappling with the new coronavirus pandemic, many have called for the introduction of rapid diagnostic tests (RDTs), which can produce results in around 10 minutes.

Healthcare experts, however, did not recommend using them due to inaccuracy, at a YouTube show Tuesday by K-Healthlog, a channel operated by The Korea Doctors’ Weekly.

RDT results come out quickly, compared to real-time polymerase chain reaction (PCR) tests now used in Korea, which take about six hours to screen out COVID-19 patients. However, RDTs have 50 to 70 percent of sensitivity, compared to PCR tests, meaning that a COVID-19 patient could test false-negative, or a healthy person could test false-positive. Such inaccuracy will add confusion, experts said.

Diagnostic testing for viral infections includes molecular diagnosis, cell culture, and antigen/antibody testing. RDTs use antigens or antibodies. Usually, it takes about two to four weeks for a human body to develop an antibody against infectious disease, antigen detection is used more for RDTs than antibody detection.

Lee Hyuk-min, director of infection control affairs at the Korean Society for Laboratory Medicine, said it was too early to introduce RDTs during a YouTube live show, K-Healthlog, hosted by The Korean Doctors’ Weekly, on Tuesday.

“Antibody testing can check the viral infection by targeting an antibody that develops after a virus gets into a human body. But the entry of a virus does not create an antibody right away,” Lee said. “So, we use antibody testing in the late-stage viral infection to look at epidemiologic linkage rather than in the early-stage infection.”

Antigen testing, often used in RDTs, is also inaccurate, compared to molecular diagnostics, he noted.

“Antigen testing amplifies a signal using various methods. So, their sensitivity is lower than the PCR tests. In clinical settings, the sensitivity of antigen testing for influenza infection is 50-70 percent of that of PCR tests,” Lee explained.

Antigen testing requires several conditions, and the most important condition would be persuading the public to tolerate inaccuracy of the test, Lee went on to say.

“If a diagnosis of flu goes wrong, a patient might get angry, but it won’t be a serious problem. But if COVID-19 testing gets wrong, it will be more than that,” Lee said.

On the condition that a treatment is available and quick diagnosis is necessary, antigen testing could help, he said. However, the nation has to mitigate the spread of COVID-19 as much as possible, so physicians are doing PCR tests, not antigen testing, he added.

Shin Hyun-young, a professor of family medicine at Myongji Hospital, said flu offers many other options for physicians because doctors could still prescribe Tamiflu at their discretion despite a wrong diagnosis.

‘Korea capable of 20,000 daily PCR tests, no need for RDTs’

In a joint statement, six diagnostics societies in Korea said, “It is very dangerous to introduce rapid diagnostic tests to detect COVID-19 during this global pandemic.”

RDTs using antigen or antibody can quickly yield results within about 10 minutes. Still, their accuracy is significantly low at 50-70 percent of that of molecular genetic tests, they said.

“Due to false results, an infected patient could freely move around without a diagnosis and transmit the virus to others, or a healthy person could be hospitalized for no reason, waste medical supplies, and become vulnerable to unnecessary infection risks, causing grave social confusion,” they said.

Korea has already established a system for massive molecular genetic tests, capable of conducting 15,000 to 25,000 PCR tests, and the accurate testing needs only about six hours, the statement said. “At this moment, Korea does not need to introduce RDTs.”

http://www.koreabiomed.com/news/articleView.html?idxno=7762
You are not getting it.

How come a manufacturer CLAIM a test to have accuracy of 80% while it delivers only 30%?
And how come a manufacturer market "Test early stage of infection" and application as "People with close contact with infected patients et al".

I don't know what you call it. Rest of the world calls it lying. But then I guess in Chinese lie and truth are synonyms, right?

If it is the fault of the manufacturing company, leave the manufacturing company accountable. No need to equate countries with a separate corporation. Anyway, if this is true, then anti-china is a good reason to attack China. There is no need to waste time trying to change their perspective.
Except when the same company was praised to have "highly accurate" result by government of the said country, China.

You cann't have both ways fellas.
 
If wrong, correct wrong, simple as that.
Talking much just wastes time.
 
We mark things in Chinese. Can you read it genius?
So, truth and lie are synonyms in Chinese?
And btw, when you market something, you are responsible for what you write in ALL languages.

Its not that I can say you a "Nice Guy" in english and a "Fils de Put" in French and be absolved of the responsibility of what I wrote.
 
If it is the fault of the manufacturing company, leave the manufacturing company accountable. One should not equate the nation with a separate corporation. Anyway, if this is true, then anti-china is a good reason to attack China. There is no need to waste time trying to change their perspective. It is impossible
Exactly, how can a country be responsible for a company. They can claim whatever accuracy, its up to the health ministry to test it in their respective countries.
 
So, truth and lie are synonyms in Chinese?
And btw, when you market something, you are responsible for what you write in ALL languages.

Its not that I can say you a "Nice Guy" in english and a "Fils de Put" in French and be absolved of the responsibility of what I wrote.
Then write to that company and complain Or Don't Buy it. If you use a gun to. Shoot yourself is it the companies fault?
 
They claimed that? even standard 24 hour test kits can't deliver that high accuracy.
Except they do. qPCR ones do.
Read the NUS study, there are tests delivering 90%+ accuracy in +ve and -ve samples and are commercially available.
 
They claimed that? even standard 24 hour test kits can't deliver that high accuracy.
I guess they were pretty desperate now, they didn't test it and then just use it. Low medical standards, how can they use things which we don't even approve.
 
You are doing circlejerk by posting the same topic that has been talking about for days, did you check before you post?
Equal treatment dear. When Chinese can sing songs of praise about "Straddling Bus", we can also talk about things that China does not so well. Telling truth is major one in that.

Who claim their rapid test kits can have that high accuray rate?
You mentioned "Standard 24 hours" ones. They do have 90% accuracy.
 

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