What is the Lancefield classification system based on?
Lancefield grouping is a serological method for classifying streptococci into one of 20 groups (designated by a letter) based on the presence of polysaccharide and teichoic acid antigens in the bacterial cell wall (Lancefield 1933).
What is Lancefield group C?
Group C streptococci, according to Lancefield’s work of 1933, belong to Gram-positive bacteria, catalase-negative and facultative anaerobes [1. C. A. Guillén Astete, N. Sánchez Gómez, and M. Luque Alarcón, “Septic Arthritis by Streptococcus equi,” Reumatología Clínica (English Edition), vol.
What is the Lancefield precipitation test?
a ring precipitation test for identification and classification of streptococci. Group-specific antibody reacts in vitro with group-specific polysaccharide to produce a ring of precipitation where the two reagents react at the interface.
What compound in the cell wall is the basis for Lancefield classification?
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.
What is the shape of a streptococci bacteria?
Streptococci are nonmotile, Gram-positive, nonsporeforming bacteria, that live in pairs or chains of varying length. They are characteristically round or ovoid in shape.
What antibiotics treat strep C?
Therapy. Groups C and G streptococcus are highly susceptible to penicillin (mean minimum inhibitory concentration (MIC) <0.2 mg/mL), and penicillin is the drug of choice in most circumstances.
What is a Lancefield antigen?
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. Notably, Enterococci and Streptococcus bovis (Lancefield Group D) are not beta-hemolytic.