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Haemophilus influenzae. Coloured transmission electron micrograph of Haemophilus influenzae bacteria. A non-motile, Gram-negative bacillus, H. influenzae is an important pathogen in young children. It colonises the upper respiratory tract in most humans within the first months of life, and is usually harmless. However, it may spread locally and cause diseases of the lower respiratory tract, such as bronchitis and pneumonia. Certain capsulated strains are the most common cause of bacterial meningitis and epiglottitis in children. Magnification x30,000 at 6x6cm size.
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