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Mar 2, 2016 · Group A and group B streptococci are beta hemolytic, whilst D are usually alpha or gamma. Streptococcus pneumoniae and viridans ("green") streptococci are alpha hemolytic. Thus, the hemolysis reaction is important in grouping streptococci. The hemolysis reaction along with one physiologic characteristic is sufficient for a presumptive clinical ...
Streptococcus zooepidemicus. Viridans streptococci. Streptococcus anginosus group. Streptococcus is a genus of gram-positive coccus ( pl.: cocci) or spherical bacteria that belongs to the family Streptococcaceae, within the order Lactobacillales (lactic acid bacteria), in the phylum Bacillota. [2]
The genus Streptococcus , a heterogeneous group of Gram-positive bacteria, has broad significance in medicine and industry. Various streptococci are important ecologically as part of the normal microbial flora of animals and humans; some can also cause diseases that range from subacute to acute or even chronic. Among the significant human diseases attributable to streptococci are scarlet fever ...
- Maria Jevitz Patterson
- 1996
The term streptococcus (“twisted berry”) refers to the bacteria’s characteristic grouping in chains that resemble a string of beads. Streptococci are microbiologically characterized as gram-positive and nonmotile. Streptococcus contains a variety of species, some of which cause disease in humans and animals, while others are important in ...
- The Editors of Encyclopaedia Britannica
Streptococci are gram-positive aerobic organisms that cause many disorders, including pharyngitis, pneumonia, wound and skin infections, sepsis, and endocarditis. Symptoms vary with the organ infected. Sequelae of infections due to group A beta-hemolytic streptococci may include rheumatic fever and glomerulonephritis.
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Streptococcal infections are caused by any one of several species of Streptococcus. These gram-positive, sphere-shaped (coccal) bacteria (see figure ) cause many disorders, including strep throat, pneumonia, and wound, skin, heart valve, and bloodstream infections. Different groups of these bacteria are spread in different ways—for example ...
Streptococcus bacteria can live in and on your body without causing symptoms. Infection can happen in your throat, middle ear, sinuses, lungs, skin, tissue under your skin, heart valves, and blood. Infections can cause red and painful swollen tissues, scabby sores, sore throat, and a rash. Doctors treat streptococcal infections with antibiotics.
