PPT-Gram-Positive Cocci (Streptococci)

Dr Nariman Sindi 1 classification The classification of streptococci is based on Hemolysis Alpha hemolytic streptococci α hemolytic Incomplete lysis partial hemolysis of red blood cells RBCs in the agar resulting in the formation of a greenish zone around their colonies. Dr. Tamer . Bedair. Lecturer of Medical Microbiology and Immunology. Contents: . Character of Streptococci. Classification of Streptococci. Strept. . . pyogenes. a. virulence factors and pathogenesis. Cocci. . Streptococci. . By . Lec. . Dr. . Thanaa. . Rasheed. . Abdulrahman. 6. th. lect. bacteriology. Streptococci of medical importance are listed in Table 1. Species. Lancefield Group. A. Introduction – There are multiple criteria by which you can classify an organism. 1. Metabolic Activities (Carbon, Energy & Oxygen sources). A) Recall that microbes may vary in their carbon & energy sources. Bacteria . One of our kingdoms. Bacteria. Bacteria are minute microscopic prokaryotes. They are unicellular organisms, which are usually identified by their specific activities, more than their general . Corynebacteria. . Streptococci. Cocci. :. spherical. Morphology:. Gram positive, . cocci. in chains . Characteristics of Streptococci. Morphology>> . Gram positive, . cocci. Arranged in chains, and some spp. arranged in pairs. Physical differences & clinical . signifigance. . . Figure 4.8b. Gram- positive bacteria. Gram-negative bacteria. Figure 4.8a. Gram-Positive cell walls. Teichoic acids:. Lipoteichoic acid links to plasma membrane. Differentiate bacteria into two large groups (the Gram Positive and the Gram negative).. Gram status is important in medicine; the presence or absence of a cell wall will change the bacterium's susceptibility to some antibiotics. Staphylococci. Dr. Oruba. Khalid abbas . . . Systemic Bacteriology. Objective : Pyogenic cocci. Pyogenic cocci : Pyogenic means “ pus forming”. Cocci means “spherical bacteria”. They include:. . . . . Dr.oruba. Khalid abbas. ACTINOMYCETES. In this lecture , we shall discuss 3 genera of actinomycetes: . Actinomyces, Nocardia. , and . Streptomyces.. . These organisms have been shown to be . 1. Demonstrate a basic understanding of commonly encountered organisms in the healthcare setting.. Discuss the importance of reviewing and interpreting Microbiology lab results.. Give examples of pathogenic vs. non-pathogenic bacteria.. Department Nursing, Second stage. Lab/6 . Practical Microbiology I . م.م. محمد عبدالرسول دبي. A/Gram + cocci (. Staphylococci and Streptococci. )..  . 1. .. Staphylococci. :. I- General features:. Zainab. Abdul . jabar. . Aldhaher. Streptococcus. is a . genus. of . spherical. . Gram-positive. . bacteria. belonging to the . phylum. . Firmicutes. ]. and the . lactic acid bacteria. group. . Streptococci. 1. Asst. Prof.. Shaima’a. Al-. Salihy. Learning objectives:. After this lab. You must be able to:. Describe streptococci under microscope.. Classify streptococcus spp. according to hemolysis pattern>. Gram Positive. Gram Negative. Gram-Positive bacteria. Gram-Negative bacteria. Cell Wall. A single-layered, smooth cell wall.  A double-layered, wavy cell-wall. Cell Wall thickness. The thickness of the cell wall is 20 to 80 .