TextBook Bacteriology: Streptococcus

Kenneth Todar, PhD University of Wisconsin Department of Bacteriology (2015-08-06)

Introduction Streptococcus pyogenes (Group A streptococcus) is a Gram-positive, nonmotile, nonsporeforming coccus that occurs in chains or in pairs of cells. Individual cells are round-to-ovoid cocci, 0.6-1.0 micrometer in diameter (Figure 1). Streptococci divide in one plane and thus occur in pairs or (especially in liquid media or clinical material) in chains of varying lengths. The metabolism of S. pyogenes is fermentative; the organism is a catalase-negative aerotolerant anaerobe (facultative anaerobe), and requires enriched medium containing blood in order to grow. Group A streptococci typically have a capsule composed of hyaluronic acid and exhibit beta (clear) hemolysis on blood agar.

Date:2015-08-06

Description:

Introduction Streptococcus pyogenes (Group A streptococcus) is a Gram-positive, nonmotile, nonsporeforming coccus that occurs in chains or in pairs of cells. Individual cells are round-to-ovoid cocci, 0.6-1.0 micrometer in diameter (Figure 1). Streptococci divide in one plane and thus occur in pairs or (especially in liquid media or clinical material) in chains of varying lengths. The metabolism of S. pyogenes is fermentative; the organism is a catalase-negative aerotolerant anaerobe (facultative anaerobe), and requires enriched medium containing blood in order to grow. Group A streptococci typically have a capsule composed of hyaluronic acid and exhibit beta (clear) hemolysis on blood agar.

Description:

Microbiología y Parasitología
Tipo de material:Texto
Language (ISO):en_US
License:Copyright
Audiencia:Licenciatura
Nivel educativo:Superior
Área de conocimiento del nivel media superior:No aplica
Área de conocimiento del nivel superior:Salud
Palabras clave:Streptococcus pyogenes and Streptococcal Disease
Relación con otro recurso:Medicina
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