BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Streptococcus pyogenes. Coloured scanning electron micrograph (SEM) of the bacteria Streptococcus pyogenes. These gram-positive bacteria are rounded or spherical cocci that typically form chains, as seen here. Healthy humans may carry these bacteria harmlessly in their throat or nose. Pathogenic strains of S. pyogenes, however, cause skin infection (including impetigo), uterine infection following childbirth and blood poisoning (septicaemia). S. pyogenes accounts for the high incidence of sore throats, tonsillitis, and middle ear infections (otitis media) in children. Treatment is with penicillin drugs. Magnification unknown.
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