Streptococcus is another type of common bacteria of pyogenic bacteria belonging to Bacillus Gang, Head of Lactobacillus, Streptococcus Division. Widespread in nature and human and animal feces and healthy human nasopharynx, and most do not cause disease. Medical Streptococcus pyogenes, Streptococcus viridans, Streptococcus pneumoniae, Streptococcus agalactiae, etc.. Cause human disease: suppurative inflammation, toxins diseases and hypersensitivity diseases.
The streptococcal cell along a flat split, often arranged in a chain of bacteria. Gram stain positive, but in the the obsolete medium or pus specimens often has negative. Widely distributed in nature. Pathogenic and non-pathogenic two categories. According to the characteristics of hemolysis on blood agar can be divided into three different types: Influenza A (α) hemolytic streptococcus, also known as Streptococcus viridans colonies around the grass green hemolytic normally lives in the oropharyngeal cavity respiratory and intestinal pathogenic weak. Strongly hemolytic toxin, beta (β) hemolytic streptococcus on blood agar around the colonies can appear 2 to 4 mm wide, clear boundaries, colorless transparent hemolytic virulent can cause various human diseases, depending on the antigen structure, divided into 20 groups of A, B, C, D, etc., in each group, due to the different surface antigen, and is divided into several subgroups, on human pathogenic overwhelming Most belong to the A group. Hepatitis C (γ) Streptococcus hemolytic, non-pathogenic to humans. Streptococcus caused disease has a complex and diverse characteristics of the one hand, due to the type of bacteria, and both the invasion force toxins; On the other hand, human tissues and organs are highly susceptible to allergic mechanisms involved in the pathogenesis. Streptococcus invasive enzyme: the hyaluronidase, streptokinase and chain Road enzymes,; toxins produced: streptolysin rash toxins. Allergic diseases such as rheumatic fever, acute glomerulonephritis, can be triggered by group A streptococcal infection.
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