GARDNERELLA VAGINALIS Gardnerella vaginalis in association with other bacteria is the causative agent of bacterial vaginosis (BV) in women. G. vaginalis is a Gram variable (i.e. they are not typed by the Gram stain), encapsulated, facultative, pleomorphic and non-motile bacillus. BV which can also be called vaginitis is a medical condition that is characterized by […]
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Bacteriology, Medical Microbiology
Klebsiella pneumoniae is a Gram-negative, encapsulated, lactose-fermenting, non-motile, facultative rod in the genus Klebsiella and family Enterobacteriaceae. In addition to O and H antigens, K. pneumoniae possess K antigens (that consists mainly of polysaccharides). K antigens are capsular antigens found mostly amongst members of the Enterobacteriaceae family; and in the case of K. pneumoniae, the
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Bacteriology
Pseudomonas aeruginosa is a non-enteric, oxidase positive, Gram-negative, motile; obligate aerobic straight or curved rod that is found in the genus Pseudomonas and family Pseudomonadaceae. They are recurrently present in small numbers as members of the normal flora in the small intestine and skin of humans especially in hospitalized patients. P. aeruginosa is the most
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Bacteriology
Culturing technique is used for the propagation of microorganisms in the microbiology laboratory; and it is an important procedure required for studying the morphological characteristics of microbes especially on solid culture media. Microorganisms are cultured in various ways and in various conditions using different growth media (inclusive of solid media or broth/liquid media). Bacterial growth
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Bacteriology, Culture media, Techniques in Microbiology Lab
Escherichia coli is a facultative, enteric, Gram-negative, motile/flagellated, and lactose-fermenting rod that occur in the genus Escherichia and family Enterobacteria or Enterobacteriaceae. Enterobacteriaceae are bacteria that naturally exist in the intestinal tract of animals and humans, and also found in water and soil. Because the natural habitat of E. coli is the intestinal tract of
Clostridium botulinum is a Gram-positive, strict-anaerobic, motile, pleomorphic, catalase-negative, endospore-forming bacillus (rod) that is ubiquitously found in the soil. The endopores of C. botulinum are sub-terminally placed or located on the bacterium and they are oval in shape. C. botulinum is found in the genus Clostridium and class Clostridia; and members are known to cause
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Bacteriology
Streaking is a microbiological technique that is used to obtain pure cultures of microorganisms (particularly bacteria) in the laboratory. It usually involves a series of drawing a loop (carrying an inoculum of the test organism or sample) back and forth on dried solid culture media. As the streaking of the microbe on the dried solid
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Bacteriology, Microbe Lab, Techniques in Microbiology Lab
Mycobacterium tuberculosis is a slim, non-motile, non-spore forming, Gram-positive, obligate aerobe, and acid-fast bacillus (rod) with a waxy cell wall. It is found in the genus Mycobacterium and family Mycobacteriaceae. Aside M. tuberculosis, M. bovis (cattle/animal pathogen), M. avium and M. leprae (causative agent of leprosy/Hansen’s disease)are the other important species of the genus Mycobacterium
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Bacteriology
Haemophilus influenza is a small, Gram-negative, non-sporulating, non-motile, urease positive, indole positive, pleomorphic, rod-like or coccobacillus blood-loving bacterium in the family, Pasteurellaceae. H. influenzae, a non-toxin producing bacterium was first isolated during the 1890 influenza pandemic, and it is often referred to as a “blood-loving” bacterium (i.e. haemophilic bacterium) because it requires growth factors which
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Bacteriology
Stool culture is demanded in the bacteriology laboratory as method for detecting and diagnosing enteric bacterial infections (i.e. infections caused by pathogens in the Enterobacteriaceae family e.g. Salmonella species and Shigella species) that lead to enteric fever, diarrhea and dysentery. Stool culture can also be requested when patients present with other gastrointestinal infections such as
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Microbe Lab, Bacteriology, Techniques in Microbiology Lab