Lancefield grouping
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Lancefield grouping is a system of classification that classifies catalase-negative Gram-positive cocci based on the carbohydrate composition of bacterial antigens found on their cell walls. The syste
Reagents used for Lancefield grouping
Streptococcus pyogenes
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Streptococcus pyogenes is a species of Gram-positive, aerotolerant bacteria in the genus Streptococcus. These bacteria are extracellular, and made up of non-motile and non-sporing cocci that tend to l
Lancefield grouping
…are not beta-hemolytic. Though there are many groups of streptococci, the principal organisms that are known to cause human disease belong to group A (Streptococcus pyogenes), group B (Streptococcus agalactiae), group C/G (Streptococcus dysgalactiae) both members of group D (Streptococcus gallolyticus and Streptococcus…
Streptococcus Pyogenes
Chains of S. pyogenes bacteria (orange) at 900× magnification
Gram stain of Streptococcus pyogenes
False-color scanning electron microscope image of Streptococcus pyogenes (orange) during phagocytosis with a human neutrophil (blue)