, Volume 26, Issue 3, pp 144–150

In vitro conversion ofBorrelia burgdorferi to cystic forms in spinal fluid, and transformation to mobile spirochetes by incubation in BSK-H medium

  • Ø. Brorson
  • S. H. Brorson
Clinical and Epidemiological Studies Originalia

DOI: 10.1007/BF02771839

Cite this article as:
Brorson, Ø. & Brorson, S.H. Infection (1998) 26: 144. doi:10.1007/BF02771839


The purpose of this study was to examine the structural alterations ofBorrelia burgdorferi when exposed to spinal fluid. Normal, mobile spirochetes were inoculated into spinal fluid, and the spirochetes were converted to cysts (spheroplast L-forms) after 1–24 h. When these cystic forms were transferred to a rich BSK-H medium, the cysts were converted back to normal, mobile spirochetes after incubation for 9 to 17 days. The cultures were examined by dark field microscopy (DFM), interference contrast microscopy (ICM) and transmission electron microscopy (TEM). When neuroborreliosis is suspected, it is necessary to realize thatB. burgdorferi can be present in a cystic form, and these cysts have to be recognized by microscopy. This study may also explain why cultivation of spinal fluid often is negative with respect toB. burgdorferi.

Copyright information

© MMV Medizin Verlag GmbH München 1998

Authors and Affiliations

  • Ø. Brorson
    • 1
  • S. H. Brorson
    • 2
  1. 1.Dept. of MicrobiologyVestfold SentralsykehusTønsbergNorway
  2. 2.Dept. of PathologyUlleval University HospitalOsloNorway

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