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Streptolysin O is an oxygen-sensitive cytotoxin, secreted by most group A Streptococcus (GAS), and interacts with cholesterol in the membrane of eukaryotic cells (mainly red and white blood cells, macrophages, and platelets), and usually results in beta-hemolysis under the surface of blood agar.
Group A streptococcal infections are a number of infections with Streptococcus pyogenes, a group A streptococcus (GAS). [ 1 ]S. pyogenes is a species of beta-hemolytic Gram-positive bacteria that is responsible for a wide range of infections that are mostly common and fairly mild. If the bacteria enters the bloodstream, the infection can become ...
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 (round cells) that tend to link in chains. They are clinically important for humans, as they are an infrequent, but usually pathogenic, part of the skin ...
Strep throat is caused by group A β-hemolytic Streptococcus (GAS or S. pyogenes). [17] Humans are the primary natural reservoir for group A streptococcus. [18] Other bacteria such as non–group A β-hemolytic streptococci and fusobacterium may also cause pharyngitis.
Lancefield grouping. 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. [1] The system, created by Rebecca Lancefield, was historically used to organize the various members of the family Streptococcaceae ...
Streptococcus agalactiae is the most common human pathogen belonging to group B of the Lancefield classification of streptococci —hence the name of group B stretococcal (GBS). Infection with GBS can cause serious illness and sometimes death, especially in newborns, the elderly, and people with compromised immune systems.
Binomial name. Streptococcus agalactiae. Lehmann and Neumann, 1896. Streptococcus agalactiae (also known as group B streptococcus or GBS) is a gram-positive coccus (round bacterium) with a tendency to form chains (as reflected by the genus name Streptococcus). It is a beta- hemolytic, catalase -negative, and facultative anaerobe. [1][2]
Streptococcus anginosus is part of the human bacteria flora, but can cause diseases including brain and liver abscesses under certain circumstances. The habitat of S. anginosus is a wide variety of sites inside the human body. Cultures have been taken from the mouth, sinuses, throat, feces, and vagina, yielding both hemolytic (mouth) and ...
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