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Shigella species: Introduction, Morphology, Culture Characteristics, Pathogenesis, Lab Diagnosis and Treatment
Introduction of Shigella species Shigella are bacteria and cause an infectious disease called Shigellosis. Shigella species are Shigella dysenterae, Shigella flexneri, Shigella boydii and Shigella sonnei. Shigella is named after the Japanese microbiologist Kiyoshi Shiga who isolated the first member of the group in 1896 from epidemic dysentery in Japan which was then called Shigella shiga and is now called S. dysenteriae. Most who are infected with Shigella develop diarrhea, fever, and stomach cramps starting a day or two after they are exposed to...
Dienes Phenomenon of Proteus: Introduction,Test Procedure, Result Interpretation and Uses
Introduction of Dienes Phenomenon Dienes phenomenon from the name of Dienes (1946) who first observed and explained about this. It is also called Dienes typing. Although the phenomenon has never been satisfactorily explained. It is used successfully to determine the relationship between strains of Proteus species in studies of cross-infection. Principle of Dienes Phenomenon When two different strains of Proteus species inoculate at different places of the same non-inhibitory medium (blood agar), the swarming of the two strains remains separated by...
Chromogenic UTI Medium: Introduction, Principle, Composition, Preparation, Procedure, Colony Morphology, Uses and Keynotes
Introduction of Chromogenic UTI Medium A chromogenic UTI Medium is applicable for the presumptive identification and differentiation of all the main micro-organisms that cause urinary tract infections (UTIs). Principle of Chromogenic UTI Medium Chromogenic UTI Medium is a differential agar that provides presumptive identification of the principal pathogens that cause infection of the urinary tract. Peptone is a complex mixture of partially digested proteins. It contains proteoses, amino acids, polypeptides, phosphates, minerals (K, Mg), and accessory growth...