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What is the Difference Between Alpha and Beta Hemolytic Streptococci

January 7, 2022Posted byDr.Samanthi

Thekey difference之间的α和β溶血性链球菌is that alpha hemolytic链球菌i是一群链球菌ibacteria that display partial hemolysis of red blood cells in theblood agarmedia, while beta-hemolytic链球菌i是一群链球菌ibacteria that display complete hemolysis of red blood cells in the blood agar media.

链球菌is a genus of gram-positive coccus or spherical bacteria. These bacteria belong to the family Streptococcaceae within the orderLactobacillales并在粉状状态下。最多链球菌ibacteria are oxidase negative, catalase negative, and facultative anaerobes. Moreover, they are often pathogenic bacteria that cause several diseases in humans. The species of genus链球菌are classified based on their hemolytic (red blood cells breakdown) properties in blood agar. According to hemolytic properties, there are three groups of链球菌ibacteria: alpha, beta, and gamma hemolytic. Therefore, alpha and beta hemolytic链球菌iare two groups of链球菌ibacteria based on hemolytic properties.

内容

1.Overview and Key Difference
2.What is Alpha Hemolytic Streptococci
3.什么是β溶血链球菌
4.Similarities – Alpha and Beta Hemolytic Streptococci
5.Alpha vs Beta Hemolytic Streptococci in Tabular Form
6.Summary – Alpha vs Beta Hemolytic Streptococci

What are Alpha Hemolytic Streptococci?

Alpha hemolytic链球菌i是一群链球菌ibacteria that displays partial hemolysis of red blood cells in the blood agar media. Hemolysis is the breakdown of red blood cells. The ability of bacterial colonies to induce hemolysis in media such as blood agar is used to classify bacteria such as链球菌i。当发生α溶血时,细菌菌落下的血琼脂培养基含量是深色和绿色的。这是因为α溶血物质会导致红细胞中血红蛋白分子中铁的氧化。因此,它在血琼脂上赋予绿色。α溶血也被称为不完全或部分溶血,因为在溶血过程后,红细胞的细胞膜仍然完好无损。

Alpha and Beta Hemolytic Streptococci - Side by Side Comparison

图01:α溶血链球菌i

Normally,链球菌pneumoniaand a group of oral链球菌i(链球菌viridians) display this alpha hemolytic property.S. pneumoniais the leading cause of bacterial pneumonia.S. pneumonia还可能引起中耳炎,鼻窦炎,脑膜炎和腹膜炎。S. viridiansis normally commensal but can be pathogenic. When pathogenic,S. viridianscauses sepsis and pneumonia.

What are Beta Hemolytic Streptococci?

Beta hemolytic链球菌i是一群链球菌ibacteria that displays complete hemolysis in red blood cells in the blood agar media. Beta hemolytic链球菌i导致细菌菌落周围和下面的血琼脂培养基中的红细胞完全裂解。溶血后,培养基中的区域显得黄色和透明。完整的溶血是由于这些称为链霉菌素的细菌产生的外毒素。有两种类型的链霉菌蛋白:streptolysin O (SLO) and streptolysin S (SLS)。SLO is secreted by Group A链球菌cus(气)和链球菌dysgalactiae。SLS is only secreted by Group A链球菌cus。

Alpha vs Beta Hemolytic Streptococci in Tabular Form

Figure 02: Beta Hemolytic Streptococci

Furthermore,链球菌cus pyogenesor Group A beta hemolytic链球菌(气)显示β溶血。有时,弱β溶血物种(B组链球菌such as链球菌cusagalactiae) cause intense hemolysis of red blood cells when they grow together with a strain葡萄球菌。这被称为营地测试。

α和β溶血之间的相似之处是什么链球菌一世?

  • 链球菌iare two groups of链球菌ibacteria based on hemolytic properties.
  • 两组的细菌均在属下分类链球菌,家族链球菌,1乳杆菌和粉状菌根。
  • Bacteria of both groups show hemolysis of red blood cells in blood agar plates.
  • They have specific hemolysins.
  • 它们是革兰氏阳性,氧化酶阴性,过氧化氢酶阴性和兼性厌氧菌。

What is the Difference Between Alpha and Beta Hemolytic链球菌一世?

Alpha hemolytic链球菌i是一群链球菌i在血琼脂培养基中显示出红细胞部分溶血的细菌,而β-溶血性链球菌i是一群链球菌ibacteria that displays complete hemolysis of red blood cells in the blood agar media. Thus, this is the key difference between alpha and beta hemolytic Streptococci. Furthermore, the area in the media appears green in colour after hemolysis by alpha-hemolytic链球菌i。另一方面,培养基中介质的区域在溶血性溶血后出现黄色和透明链球菌i。

下面的信息图显示了α和β溶血链球菌以表格形式进行并排比较的差异。

Summary – Alpha vs Beta Hemolytic Streptococci

Alpha and beta hemolytic链球菌iare two groups of链球菌ibacteria based on hemolytic properties. Alpha hemolytic链球菌idisplay partial hemolysis of red blood cells in the blood agar media, while beta-hemolytic链球菌idisplay complete hemolysis of red blood cells in the blood agar media. So, this is the key difference between alpha and beta hemolytic Streptococci.

Reference:

1.“Alpha Hemolytic Streptococcus。” An Overview | ScienceDirect Topics.
2. “β溶血链球菌。” An Overview | ScienceDirect Topics.

Image Courtesy:

1.“”链球菌al hemolysis” By Y tambe – Y tambe's file(CC BY-SA 3.0)via Commons Wikimedia
2. “血琼脂链球菌链球菌” 43trevenque - 自己的作品(CC BY-SA 4.0)via Commons Wikimedia

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Filed Under:Microbiology

About the Author:Dr.Samanthi

Dr.Samanthi Udayangani holds a B.Sc. Degree in Plant Science, M.Sc. in Molecular and Applied Microbiology, and PhD in Applied Microbiology. Her research interests include Bio-fertilizers, Plant-Microbe Interactions, Molecular Microbiology, Soil Fungi, and Fungal Ecology.

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