This electron micrograph shows an amoeba, Hartmannella vermiformis (orange) using an extended pseudopod ("false foot") to entrap a Legionella pneumophila bacterium (green). After it is ingested, the Legionella pneumophila bacterium, which causes Legionnaires' disease, can survive within the amoeba, which then becomes a "Trojan horse" that harbors the pathogen. (Image courtesy of the Centers for Disease Control and Prevention and Dr. Barry S. Fields)[back]
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