Coloured scanning electron micrograph (SEM) of an amoeba (Vermamoeba vermiformis, orange) engulfing a bacterium (Legionella pneumophila, green) with an extended pseudopod (arm-like projection). This interaction has implications for healthcare as bacteria do not die once engulfed, and Vermamoeba vermiformis is resilient and thermotolerant. As such, pathogenic bacteria such as Legionella pneumophila become harder to kill as the amoeba acts as a protective layer.