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Practical Cardiovascular System

Practical Cardiovascular System. By. Dr. Emad AbdElhameed Morad. Lecturer of Medical Microbiology and Immunology. Streptococci. Group A beta hemolytic streptococci (Streptococcus pyogenes). Gram positive cocci in chains. LAB diagnosis Streptococcus pyogenes. Specimen:

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Practical Cardiovascular System

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  1. Practical Cardiovascular System By Dr. Emad AbdElhameed Morad Lecturer of Medical Microbiology and Immunology

  2. Streptococci Group A beta hemolytic streptococci (Streptococcus pyogenes)

  3. Gram positive cocci in chains

  4. LAB diagnosis Streptococcus pyogenes • Specimen: • Throat swab in case of follicular tonsillitis. • Direct smear stained with gram stain: • Shows Gram positive cocci in chains + pus cells. • Culture: • Done on blood agar at 37 degree. • Beta hemolytic colonies are obtained + catalase –Ve. • Bacitracin test: • This bacterium is sensitive to bacitracin.

  5. Beta hemolysis Gram positive cocci in chains + pus cells

  6. α (partial) hemolysis

  7. Bacitracin test

  8. Laboratory diagnosis of rheumatic fever: C-reactive protein (CRP): latex agglutination test. Antistreptolysin O titer (ASOT): latex agglutination test. A titer of 200 IU/ml or more is significant. Erythrocyte sedimentation rate (ESR).

  9. Latex agglutination test

  10. GOOD LUCK

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