Resistance to apoptosis of HPCs upon B henselae infection and cytokine secretion. (A) Detection of apoptosis in HPCs 2 days after infection (MOI 100) with B henselae (red signal) by TUNEL reaction (green signal). Nuclei were stained with DAPI (light blue signal). Scale bar: 20 μm. (B) Determination of IL-8 and VEGF secretion by HPCs upon infection with B henselae. CD34⁺ cells were infected (MOI 100) and supernatants taken 5 days later for ELISA. Values are given in pg/mL. *Significant difference compared with uninfected control cells (P < .01).