Figure 4. Phagocytosis of live Borrelia burgdorferi by uninfected and Rickettsia peacockii-infected DAE15 cells. Coiled spirochetes are seen inside the cells (arrows) and morphologically-normal spirochetes stained with FITC-conjugated polyclonal antiborrelia antibodies can be seen adherent to cytochalasin B-treated cells (black arrowheads). Notice that morphologically normal spirochetes (white arrowheads) and coiled spirochetes are also present in the cytochalasin B treated cells. R. peacockii are indicated by the arrowheads with asterisks. Scale bar, 10 μm.