BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Haemophilus influenzae. Coloured scanning electron micrograph of the bacteria Haemophilus influenzae. A non-motile Gram-negative bacillus, H. influenzae is an important pathogen in children aged 1-5 years. It colonises the upper respiratory tract in most humans within the first months of life, and is usually harmless. It may, however, spread locally and cause diseases of the lower respiratory tract such as bronchitis and pneumonia and of the ear, otitis media. Certain capsulated strains are the most common cause of bacterial meningitis and epiglottitis in children. Magnification unknown.
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