J.L. CARSON, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY J.L. CARSON, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Streptococcus bacterium. Coloured transmission electron micrograph (TEM) of Streptococcus bacteria group A. The bacterium at centre is undergoing cell division which is almost completed. This beta-haemolytic (group A) Streptococcus bacteria are rounded or spherical Gram-positive cocci. These bacteria are the most common cause of tonsillitis. They attach to the surface of the tonsil, multiply and release harmful substances. Also they are a common cause of puerperal fever in mothers. Magnification: x30,000 at 35mm size.
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