No they changed the way the messure what is a success. From testing for covid. To testing for covid to finding the most infectious people. The didn't improve the accuracy they moved the goal posts the fiddled the numbers.
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Lateral flow tests and PCR (polymerase chain reaction) tests do different things:
LFTs pick up the most infectious people by detecting material from the surface proteins of the virus
PCRs detect genetic material of the virus which can be present in the body for several weeks after somebody is actually capable of passing it on |