Streptococcus pyogenes bacteria

Streptococcus pyogenes bacteria

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Credit: MICHAEL ABBEY/SCIENCE PHOTO LIBRARY

Caption: Colonies of Streptococcus pyogenes, a species Gram- positive bacteria, growing on sheep blood agar. Species of Streptococci may be classified according to their haemolytic activities: pyogenes is Beta-haemolytic. Beta-haemolysis the production, around a colony of the bacteria growing on blood agar, of a zone of colourless medium, in which the red cells have been lysed and the haemoglobin decolourized. Healthy humans carry strains of potentially pathogenic S. pyogenes their throats & noses, which may give rise to a range of diseases. The most common is an acute sore throat, especially in young children. Scarlet fever is a S. pyogenes infection of the throat.

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Keywords: bacteria, bacterial, bacteriology, bacterium, blood agar, culture, cultured, haemolysis, haemolytic, micro-organisms, microbe, microbes, microbiology, nutrient, petri dish, scarlet fever, streptococcus pyogenes, throat infection, type

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