This is the LFTs that American authorities told their people to stop using as they were unreliable.
Some interesting data.
NHS website (
https://www.nhs.uk/conditions/coron...oronavirus-tests-if-you-do-not-have-symptoms/) says they are 99.9% accurate.
"Research shows rapid tests are 99.9% accurate. This means the chance of getting a false-positive result (where the result shows as positive but is actually negative) is extremely low."
However this only applies to people who don't have the virus and the test showing positive. The numbers for people who are infected but test negative are very different.
It is estimated that around one-third of people with COVID-19 do not have symptoms and could be spreading the virus unknowingly. To help tackle this, the government has rolled out rapid lateral flow antigen tests that can detect cases in under 30 minutes, meaning those who have a positive test...
pharmaceutical-journal.com
Rapid antigen (lateral flow) tests are better at identifying covid-19 infection in people with symptoms than in those with none, although the diagnostic accuracy of different brands of tests varies widely, a Cochrane review has found.1 The review’s lead author criticised the UK government for...
www.bmj.com
They found that in people with confirmed COVID‐19, antigen tests correctly identified COVID‐19 infection in an
average of 72% (ranging from 34% to 88%) of people with symptoms,
compared with 58% of people without symptoms. In addition, they found that the tests were most accurate when used in the first week after symptoms developed.
So according to this almost half of people with the virus and no symptoms will be given a negative result and 1/4 of those with symptoms as well. Yay!