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 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 of … 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

Cultural Characteristics of E. coli

Cultural Characteristics of E. coli

Cultural Characteristics of E. coli 1. E. coli is facultative anaerobes. 2. Its optimum growth temperature is 37°C and ranges from 10°C to 40°C. E. coli on Nutrient Agar (NA) 1. They appear large, circular, low convex, grayish, white, moist, smooth and opaque. 2. They are of 2 forms: Smooth (S) form and Rough (R) … Read moreCultural Characteristics of E. coli

Habitat of Bacillus cereus

Habitat of Bacillus cereus

Habitat of Bacillus cereus Bacillus cereus is isolated from soil, vegetables, milk, cereals, spices, fried rice, cooked poultry and meats, soups and desserts. It is also found in mashed potato, beef stew, apples, hot chocolates sold in vending machines and other improper food handling areas. In 1887, B. cereus was isolated from air in a cowshed … Read moreHabitat of Bacillus cereus