Streptococcus bacteria. Coloured transmission electron micrograph (TEM) of chains of bacteria,Streptococcus pyogenes. Typically forming chains of cells,these Gram-positive bacteria are rounded or spherical cocci. Healthy humans may carry these bacteria harmlessly in their throat or nose. Pathogenic strains of S.pyogenes,however,account for the high incidence of sore throats,tonsilli- tis,and middle ear infections (otitis media) in children. The bacteria may also cause skin infect- ions (including impetigo); puerperal sepsis of the uterus following childbirth; and blood poisoning (septicaemia). Treatment is with penicillin drugs. Magnification: x8000 at 6x4.5cm size | |
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