This test isnt meant to be used to in the manner that the FSC is trying to use it for.
And the warning on the test insert clearly says "except for incubating or early primary disease....
Warning: A positive result is not useful for establishing a diagnosis of syphilis. In most situations, such a result may reflect a prior treated infection; a negative result can exclude a diagnosis of syphilis except for incubating or early primary disease.
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