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Light microscopic analysis of human monocytes infected with S. flexneri strains. Bacteria were left in contact with monocytes for 30 min followed by gentamicin treatment for up to 4 h. Monocytes were stained with a modified Wright's stain after infection with M4243A1 (A), 2457T (B), and pWR700 (C). (D) Noninfected monocytes. Magnification, ×1,000.
