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Introduction of Serratia marcescens Serratia is a member of the family Enterobacteriaceae, and it is a Gram-negative, facultatively anaerobic, rod-shaped bacterium lacking spores and a capsule. This is a Gram-negative rod/ bacilli that thrives in moist environments. It frequently contaminates solutions and hospital equipment, and the human reservoirs …
Introduction of Enterobacteriaceae The family Enterobacteriaceae was first proposed by Rahn in 1936 and it is a very large group of gram-negative bacteria that possess a number of common morphological and biochemical properties and similar DNA base compositions. The widely used systems for the classification …
Introduction of LF and NLF Gram-Negative Bacteria on MacConkey Medium MacConkey agar/ medium is recommended for use as a selective, differential, and indicator growth medium for the isolation of gram-negative bacilli including coliform organisms and enteric pathogens, on the basis of lactose fermentation. Peptones (meat …
Introduction of Haemophilus The genus Haemophilus is a pleomorphic Gram-negative coccobacilli fastidious bacteria and thus they do not grow on an ordinary medium like nutrient agar and they need chocolate agar to grow (H. influenzae) due to having X, V, and both X and V growth factors in it. …
Introduction of Staphylococcus and Micrococcus Staphylococcus (pleural-staphylococci) is spherical, non-motile, gram-positive in singles, pairs, and clusters. On nutrient agar, growth is opaque and golden yellow or white color. Catalase and coagulase test positive (Staphylococcus aureus), oxidase negative, aerobic or facultative anaerobe. Parasite of humans and …
Introduction of Streptococcus pneumoniae and Viridans streptococci Streptococcus pneumoniae is also called pneumococcus and pneumococcus is the commensals of the upper respiratory tract. It is an important etiological agent of pneumonia and otitis media in children that differs from streptococci in its morphology (diplococci), bile …
Introduction of String Test String test is a special test of bacteria to identify Vibrio cholerae (String test positive) from Vibrio species and other bacteria like Aeromonas species and Plesiomonas shigelloides. This assay can perform on a glass slide or plastic petri dish, suspending overnight …
Introduction of Gram-Positive Bacteria Identification Identification of Gram-positive bacteria is a little bit harder than Gram-negative bacteria since the most common bacterial etiological agents are Gram-negative bacteria and the vendors or suppliers are directly involved in supplying common tests reagents and test kit accessories. Due …