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We assessed the ability of Legionella species that have not been associated with disease to infect macrophage-like U937 cells. Two of fourteen species tested exhibited a 50% infective dose that was within I log unit of that of virulent L. pneumophila. Indeed, intracellular CFU of L. jamestowniensis and L. parisiensis increased 100-fold over a 72-h period. These data indicate that additional legionellae can flourish within phagocytes and therefore, can, if given the opportunity, cause disease.

Infection of macrophage-like cells by Legionella species that have not been associated with disease