"Antibodies normally persist in the blood for months or even years after the infection is gone; therefore, the test cannot be used to determine cure."

https://www.cdc.gov/lyme/diagnosistesting/index.html

Sorry I meant IgM not IgG.

The page says that: "Positive IgM results should be disregarded if the patient has been ill for more than 30 days."

The reason may be this:

https://www.sciencedirect.com/science/article/pii/S1198743X1...

But they give no scientific arguments for that. They simply voice an ill-argued opinion that basically amounts to that they do not BELIEVE in IgM antibodies for Bb s.l., even though the test objectively does show them in a large number of people diagnosed and treated for Borreliosis.

Thanks for responding. But that study says they assumed the results were false positives.

Maybe for the purpose of that paper that’s fine. But I’m not sure if it supports your statement.

They also list a few reasons for the assumption.

Anyway, the study itself is not the reason for the quoted statement on the CDC page. I was just trying to find some relevant basis for the statement, and this study has some reasons listed in the dicussion/conclusion.