DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY
Streptococcus pyogenes bacteria. Coloured trans- mission electron micrograph (TEM) of a section through Streptococcus pyogenes bacteria. The bacterium at lower centre is dividing into two cells by binary fission. Streptococcus pyogenes is a gram- positive, rounded or spherical (coccus) bacteria. Many humans may carry it harmlessly in their throat or nose. Pathogenic strains, however, cause skin infections such as impetigo, uterine infection after childbirth, and blood poisoning (septicaemia). They also cause a sore throat, tonsillitis and middle ear infections (otitis media) in children. Magnification: x57,000 at 6x7cm size.
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