DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY
Coloured transmission electron micrograph of a dividing bacterium Haemophilus influenzae, showing its DNA (blue) at the centre of the cell. 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; x60,000 at 6x4.5cm size.
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