The secretion of chemokines secreted by unstimulated or Borrelia burgdorferi - or interferon-gamma (IFN-γ)-stimulated peripheral blood mononuclear cells (PBMCs) or synovial fluid mononuclear cells (SFMCs) from 11 patients with Lyme arthritis. After 5 days of incubation, the levels of chemokines were measured in the cell supernatants. The horizontal bars represent the median values. The highest values for CXCL9 were off the scale and are shown numerically. With each stimulus, chemokine levels did not differ significantly between PBMCs and SFMCs.