Analysis of intra-specific variation in the fatty acid profiles of Borrelia burgdorferi.

Analysis of the fatty acid methyl esters (FAMEs) of bacteria is a commonly used chemotaxonomic technique. Application of this methodology to spirochaetes associated with Lyme borreliosis revealed distinct clusters corresponding to three genetically distinguished groups: Borrelia burgdorferi sensu stricto, B. garinii, and the VS461 group. However, B. garinii formed a common group with B. hermsii, a relapsing fever spirochaete, and VS461 grouped with B. turicatae and B. parkeri, two other relapsing fever spirochaetes. The diversity in fatty acid profiles of Lyme disease spirochaetes has implications for the protean clinical manifestations of the disease.