B henselae infects monocyte-derived DCs. DCs untreated or infected with B henselae were stained with anti-BH. No reactivity is detectable in uninfected DCs (A), whereas the majority of infected DCs display a strong positivity (B) with a granular cytoplasmic pattern (B inset). Immunoperoxidase technique for anti-BH counterstained with Meyer hematoxylin. Original magnification, × 200 (A-B) and × 600 (B inset).