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Haemophilus influenzae. Coloured Scanning Electron Micrograph (SEM) of a cluster of Haemophilus influenzae bacteria. These non-motile, Gram- negative bacilli bacteria are an important pathogen in young children. They colonize the upper respiratory tract in most humans within the first few months of life, and usually are harmless. However, they 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. Treatment includes the use of antibiotic drugs. Magnification: x2500 at 6x6cm size.
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