JUERGEN BERGER / SCIENCE PHOTO LIBRARY JUERGEN BERGER / SCIENCE PHOTO LIBRARY
Haemophilus influenzae bacteria. Coloured scanning electron micrograph (SEM) of Haemophilus influenzae bacteria. Some harmless strains of these Gram-negative bacteria are to be found in the human upper respiratory tract. Other strains are pathogenic, causing pneumonia, bronchitis and, in young children, a type of meningitis. Magnification unknown.
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