csodjd
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That's not correct. The issue they raise is contagious, not infection. They assert that the sensitivity and yes-no nature of the tests results in people that are not able to spread the disease because their viral load is too low being flagged and treated as if they are contagious.Regardless the reason, according to the New York Times the tests are too sensitive and they report 10 times more infected people than they should.
<In Massachusetts, from 85 to 90 percent of people who tested positive in July with a cycle threshold of 40 would have been deemed negative if the threshold were 30 cycles, Dr. Mina said. “I would say that none of those people should be contact-traced, not one,” he said. >
Your Coronavirus Test Is Positive. Maybe It Shouldn’t Be. (Published 2020)
The usual diagnostic tests may simply be too sensitive and too slow to contain the spread of the virus.www.nytimes.com
"But yes-no isn’t good enough, he added. It’s the amount of virus that should dictate the infected patient’s next steps. 'It’s really irresponsible, I think, to forgo the recognition that this is a quantitative issue,' Dr. Mina said. ... The PCR test amplifies genetic matter from the virus in cycles; the fewer cycles required, the greater the amount of virus, or viral load, in the sample. The greater the viral load, the more likely the patient is to be contagious."
In other words, using "infected" as opposed to "contagious" as defining "positive" leads to treating some non-contagious people as if they are contagious.
From a public health/epidemic control standpoint, it seems to me its is safer to assume anyone with evidence of the virus in them is contagious, and be wrong by over-quarantining, rather than the converse, which results in failing to quarantine some that should have been because they WERE in fact contagious, especially at a point in time where there are no effective treatments. As treatments arise there is room to take more risk by increasing the number of false negatives.
There is also the rather notable problem that, as of now, nobody knows what viral load indicates contagious.