You have to be shedding enough for tests to work. “About 40% of infections are spread by asymptomatic people with high viral loads” - but without symptoms, they are unlikely to be getting tested. @propublica
https://twitter.com/DrTomFrieden/status/1330154865583067136
Quick tests as used in the US are very flawed. They throw false positives as well as false negatives.
“anyone who gets a single negative result shouldn’t use it as an excuse to go to a bar” or anywhere for that matter
@lisalsong
propublica.org/article/rapid-…
“anyone who gets a single negative result shouldn’t use it as an excuse to go to a bar” or anywhere for that matter
@lisalsong
propublica.org/article/rapid-…
HHS has directed nursing homes “to use [antigen tests] off-label, in a way in which they were untested and unproven.”
July, Vermont
The Quidel test showed 64 patients (mostly asymptomatic) as positive.
PCR, done twice, found four positives. All symptomatic.
May. FDA antigen test approval was based on only 209 samples.
July. BD, 226
August. Abbott, 102
The Quidel test showed 64 patients (mostly asymptomatic) as positive.
PCR, done twice, found four positives. All symptomatic.
May. FDA antigen test approval was based on only 209 samples.
July. BD, 226
August. Abbott, 102
October, Nevada, Quidel/BD
3,725 tests
Nursing homes double-checked 39 positive samples and 23 of them tested negative via PCR test
State directed nursing homes to stop all antigen testing
3,725 tests
Nursing homes double-checked 39 positive samples and 23 of them tested negative via PCR test
State directed nursing homes to stop all antigen testing
Research from August: “if quarter of American school kids were tested three times a week with an antigen test that’s 98% specific, it would produce 800,000 false positives a week that need to be double checked by PCR tests.”
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