Streptococcus bacteria on tonsil

Streptococcus bacteria on tonsil

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Caption: Streptococcus bacteria. Transmission electron micrograph (TEM) of a section through a Streptococcus bacterium attached to a human tonsil cell (at lower frame). This beta-haemolytic (group A) Streptococcus bacterium (at top) is a rounded or spherical Gram-positive cocci. Surrounding the bacterial cell contents (black) is the cell wall (thin, grey). Around the outside is the capsule (dark, irregular) forming a loose slime layer. These bacteria are the most common cause of tonsillitis. To cause the disease they attach to the tonsil cell surface. When attached they can multiply and release harmful substances. Magnification x90,000 at 10x8 inch size.

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Keywords: bacteria, bacterial, bacterial capsule, bacteriology, bacterium, capsule, cause, electron micrograph, micro-organisms, microbe, microbes, microbiology, slime layer, sore throat, streptococcus, streptococcus group a, tem, throat, tonsil cell, tonsillitis, transmission, type

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