Habitat and Morphology of Listeria monocytogenes

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 … Read moreHabitat and Morphology of Listeria monocytogenes

Habitat and Morphology of Corynebacterium diphtheriae

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. … Read moreHabitat and Morphology of Corynebacterium diphtheriae

Habitat and Morphology of Neisseria gonorrhoeae

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 … Read moreHabitat and Morphology of Neisseria gonorrhoeae

Habitat and Morphology of Streptococcus pyogenes

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 … Read moreHabitat and Morphology of Streptococcus pyogenes

Cultural characteristics of Clostridium perfringens

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 … Read moreCultural characteristics of Clostridium perfringens

Habitat and Morphology of Staphylococcus aureus

Habitat and Morphology of Staphylococcus aureus

Habitat and Morphology of Staphylococcus aureus Habitat Natural habitat is mammalian body surfaces. They are normal flora of skin and mucous membrane. Also present in nose / the anterior nares. They can also be found in Pharynx. Found in stratified epithelial cells or mucous or serum constituents associated with these cells. Found in skin/nasal passage … Read moreHabitat and Morphology of Staphylococcus aureus

Habitat of Clostridium perfringens

Habitat of Clostridium perfringens

Habitat of Clostridium perfringens Clostridium perfringens are isolated from fecal specimens from human and animals. They are an inhabitant of human normal intestinal flora. They are present in nature and can be found as a normal component of decaying vegetation, marine sediments and soil. Beef, poultry, gravies and dried or pre-cooked foods are common sources … Read moreHabitat of Clostridium perfringens

Habitat and Morphology of Mycobacterium tuberculosis

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. … Read moreHabitat and Morphology of Mycobacterium tuberculosis

Growth at 42°C Test- Principle, Procedure and Result Interpretation

Growth at 42°C Test- Principle, Procedure and Result Interpretation

Growth at 42°C Test- Principle, Procedure and Result Interpretation Purpose of Growth at 42°C Test This test is used to differentiate a pyocyanogenic pseudomonads from other Pseudomonas sp. Principle of Growth at 42°C Test The test is used to determine the ability of an organism to grow at 42°C. Several Pseudomonas species have been isolated in the … Read moreGrowth at 42°C Test- Principle, Procedure and Result Interpretation

Gelatin Hydrolysis Test- Principle, Procedure and Result Interpretation

Gelatin Hydrolysis Test- Principle, Procedure and Result Interpretation

Gelatin Hydrolysis Test- Principle, Procedure and Result Interpretation Objective of Gelatin Hydrolysis Test The production of gelatinases capable of hydrolyzing gelatin is used as a presumptive test for the identification of various organisms, including Staphylococcus sp., Enterobacteriaceae, and some gram-positive bacilli. Principle of Gelatin Hydrolysis Test This test is used to determine the ability of an organism … Read moreGelatin Hydrolysis Test- Principle, Procedure and Result Interpretation