- Salmonella-triggered reactive arthritis: use of polymerase chain reaction, immunocytochemical staining, and gas chromatography-mass spectrometry in the detection of bacterial components from synovial fluid. Nikkari, S., Rantakokko, K., Ekman, P., Möttönen, T., Leirisalo-Repo, M., Virtala, M., Lehtonen, L., Jalava, J., Kotilainen, P., Granfors, K., Toivanen, P. Arthritis Rheum. (1999)