BSIP / SCIENCE PHOTO LIBRARY BSIP / SCIENCE PHOTO LIBRARY
Streptococcus pyogenes bacteria. Coloured scanning electron micrograph (SEM) of Streptococcus pyogenes bacteria. These Gram-positive cocci (spherical) bacteria are harmlessly carried by many people in their throats or noses. Pathogenic strains, however, cause skin infections such as impetigo, uterine infection after childbirth, and blood poisoning (septicaemia). They can also cause sore throat, tonsillitis and infections of the middle ear (otitis media). Magnification: x3000 at 35mm size.
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