Morphology of Bacillus cereus

Morphology of Bacillus cereus

Morphology of Bacillus cereus Bacillus cereus is gram positive rod shaped bacilli with square ends. Occasionally may appear gram variable or even gram negative with age. They are single rod shaped or appears in short chains. Clear cut junctions between the members of chains are easily visible. Tissue section staining may appear long and filamentous. … Read more Morphology of Bacillus cereus

Morphology of Clostridium perfringens

Morphology of Clostridium perfringens

Morphology of Clostridium perfringens Clostridium perfringens is large rectangular gram positive bacilli with rounded or truncated ends. It is pleomorphic with straight or curved rods. Size is about 3-8 µm X 0.4-1.2 µm. It is capsulated, non-motile and non-flagellated pathogenic bacteria. It contains spores with central or sub-terminal spores but spores are rarely seen. Endospores … Read more Morphology of Clostridium perfringens

Habitat of E. coli

Habitat of E. coli

Habitat of E. coli E. coli was discovered by Theodor Escherich in 1885 after isolating it from the faeces of newborns. E. coli is the normal flora of human body. The niche of E. coli depends upon the nutrients availability within the intestine of host organisms. The primary habitat of E. coli is in the gastrointestinal (GI) … Read more Habitat of E. coli

Biochemical Characteristics of Mycobacterium tuberculosis

Biochemical Characteristics of Mycobacterium tuberculosis

Biochemical Characteristics of Mycobacterium tuberculosis Some of the biochemical test results are as follows: S.N. Biochemical Test Results 1 5% NaCl Tolerance Negative (-ve) 2 68°C Catalase Test Negative (-ve) 3 Acid Phosphatase Negative (-ve) 4 Amidase Test Positive (+ve) 5 Arylsulphatase Test Negative (-ve) 6 Growth on P-Nitrobenzoic Acid Negative (-ve) 7 Growth on … Read more Biochemical Characteristics of Mycobacterium tuberculosis

Cultural Characteristics of Mycobacterium tuberculosis

Cultural Characteristics of Mycobacterium tuberculosis

Cultural Characteristics of Mycobacterium tuberculosis Culture is the gold standard for laboratory confirmation of Tuberculosis. Growing bacteria are required to perform drug-susceptibility testing and genotyping. In Lowenstein-Jensen (LJ) medium It is an egg based medium and growth is quite slow. It takes 6-8 weeks to get visual colonies on this type of media. Colonies are … Read more Cultural Characteristics of Mycobacterium tuberculosis