Laboratory diagnosis of Streptococcus pyogenes 4.15/5 (20)

Laboratory diagnosis of Streptococcus pyogenes

Laboratory diagnosis of Streptococcus pyogenes 1. Specimens Throat swab Pus Cerebrospinal fluid Blood Serum for antibody determinant 2. Smear Gram staining Purple color cocci in chain arrangement Not to be confused with Viridans Streptococci from throat swab sample since both have same appreance 3. Culture Culture on blood agar Addition of bacitracin in inoculum: S […]

Clinical manifestation and Pathogenesis of Streptococcus pyogenes 4.75/5 (12)

Clinical manifestation and Pathogenesis of Streptococcus pyogenes

Clinical manifestation and Pathogenesis of Streptococcus pyogenes Virulence factors of Streptococcus pyogenes A. Antigenic structure M protein: rod like coiled structure with two major structural classes; Class I and Class II ;major virulence factor;resist phagocytosis and intracellular killing by polymorphonuclear leukocytes in the absence of antibodies. B. Toxins and enzymes Streptokinase It is also called […]

Habitat and Morphology of Listeria monocytogenes 4.93/5 (27)

Habitat and Morphology of Listeria monocytogenes

Habitat and Morphology of Listeria monocytogenes Habitat of Listeria monocytogenes They are the natural pathogens of wide range of animals, birds, fish, ticks and crustacean. They are saprophytic in soil, water, sewage and plants decaying. They occasionally colonizes the human gastrointestinal tract (1-10%). They can be isolated from foods for human consumption, including raw and […]

Habitat and Morphology of Corynebacterium diphtheriae 4.55/5 (20)

Habitat and Morphology of Corynebacterium diphtheriae

Habitat and Morphology of Corynebacterium diphtheriae Habitat of Corynebacterium diphtheriae Found in nasopharynx as well as in skin lesions, which actually represent a reservoir for the spread of diphtheria. Also found in mouth, throat, nose, skin and wound of infected person. Animals do not easily contract diphtheria. Patients carry toxigenic organism upto 3 months after infection. […]

Habitat and Morphology of Neisseria gonorrhoeae 4.44/5 (34)

Habitat and Morphology of Neisseria gonorrhoeae

Habitat and Morphology of Neisseria gonorrhoeae Habitat of Neisseria gonorrhoeae Human is only the natural host. Found in human urogenital tract. Rectal carriage in healthy individuals. Typically seen in pus cells (intracellular) Found intracellularly in polymorphonuclear leukocytes, or a specific category of white blood cells with varying shapes of nuclei. Morphology of Neisseria gonorrhoeae Gram –ve […]

Habitat and Morphology of Streptococcus pyogenes 4.54/5 (24)

Habitat and Morphology of Streptococcus pyogenes

Habitat and Morphology of Streptococcus pyogenes Habitat of Streptococcus pyogenes They are found in throat and skin of human. They are commensals of upper respiratory tract. Carrier rate of S. pyogenes in the respiratory tract is only few in adults, over 10% in children attending kindergarten. Opportunistic pathogens May survive in dust for some times. Morphology […]

Cultural characteristics of Clostridium perfringens 4.94/5 (16)

Cultural characteristics of Clostridium perfringens

Cultural characteristics of Clostridium perfringens It is an anaerobic bacteria but can grow under micro-aerophilic condition. They form large, translucent, flat and filamentous colonies with irregular edges. PH: 5.5 to 8.0 (Average PH: 7.2) Temperature: 20°C to 50°C (Average: 37°C) At 45°C, generation time is 10 minutes. Clostridium perfringens on Robertson’s Cooked Meat Broth Saccharolytic […]

Habitat and Morphology of Mycobacterium tuberculosis 4.48/5 (27)

Habitat and Morphology of Mycobacterium tuberculosis

Habitat and Morphology of Mycobacterium tuberculosis Habitat Human is only the know reservoir. Usually found in the lungs but can also live in any part of the body. They may be obligate pathogen, facultative or opportunistic pathogens or free living. Usually infect the mono-nuclear phagocytes. Can also be infected by the consumption of unpasteurized milk. […]

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