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There's no definitive accredited lab check as far as I know. At least here in Germany the official serologic tests for late stage Lyme can come back negative for years until the disease really progresses badly - even cerebrospinal fluid results may be normal despite neurological symptoms. My specialist uses elispot lab tests for Borrelia b. OspA, antigen and LFA-1 markers. Other practitioners use westernblot lab resu…
have you seen recent immunostaining result? albeit in research, amazingly you can actually see the bacteria. They claim it can be cultured too. https://www.frontiersin.org/articles/10.3389/fneur.2021.6280...
Check out also Dualdur, received 3MEur from EU in 2018.