CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY
Bacterial phagocytosis. Light microscopy footage of a human phagocytic cell (macrophage) engulfing and destroying an Escherichia coli (E. coli) bacterium (lower right). E. coli bacteria are a normal part of the intestinal flora in humans and other animals, where they aid digestion. However, some strains can produce a toxin that leads to severe illness, or even death. Normal strains can also produce infections in those with weakened immune systems. Several cells of the human immune system are phagocytic, seeking out and destroying invading bacteria.
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