Phagocytosis of <i>Lm</i> by GM-Mφ (GM, black bars) or M-Mφ (M, white bars) generated from monocytes isolated by negative (A) or positive (B) selection or THP-1 macrophages (C) at different multiplicities of infection (MOI).

<p>Phagocytosis is measured as colony forming units (CFU) per well. Results from one representative donor (A and B) or experiment (C) measured in triplicates are shown and similar results were obtained with cells of at least three different donors or in three independent experiments. Statistical analysis was performed by pairwise comparison of GM-Mφ vs. M-Mφ at the different MOIs using Student's <i>t</i>-test (n.s.: not significant).