Strategy used to infect macrophages by the zoonotic bacteria Leptospira

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We examined in this study the mechanism of macrophage infection by pathogenic Leptospira. Pathogenic leptospires were found within phagosomes. However, acquisition of lysosomal markers lagged behind that of non-pathogenic leptospires-containing phagosomes. In macrophages infected with pathogenic leptospires, intact leptospires were found within vacuoles at 24 hours post infection, while non-pathogenic leptospires were degraded. Furthermore, a population of pathogenic leptospires was released to the extracellular milieu.