Last updated on June 21st, 2021Moraxella catarrhalis is a small gram-negative diplococcus that resembles the cocci of the genus Neisseria. The genus Moraxella is one of the several in the family Neisseriaceae; other medically important […]
Last updated on June 3rd, 2021Treponema pallidum is a thin, delicate, tightly wound spirochaete that cannot be seen in Gram-stained smears. So, dark-field microscopy is used to demonstrate the presence of motile Treponema pallidum in […]
Last updated on May 21st, 2021Critical/panic values are defined as values that are outside the normal range to a degree that may constitute an immediate health risk to the individual or require immediate action on […]
Last updated on May 21st, 2021Microbiology lab should have a policy that defines conditions in which a specimen is unacceptable for processing. Specimen rejection criteria should be distributed to all clinical practitioners. Requesting physician or […]
Last updated on May 30th, 2021General Characteristics Gram-negative, non-spore-forming, non-motile, pleomorphic bacilli; appearing as slender rods or coccobacillus forms. Obligate anaerobe It is also probably the most frequent anaerobe isolated from clinical specimens. Habitat It […]
Last updated on June 21st, 2021Actinomyces comprised a heterogeneous group of gram-positive, pleomorphic bacilli. Other properties are: facultatively anaerobic or microaerophilic, non-spore-forming, non-acid-fast (this is a contrast to another bacteria, Nocardia which is acid-fast) Non-motile […]
Last updated on June 21st, 2021Francisella tularensis causes life-threatening infections of animals (rabbits, hares, and rodents) and people (zoonotic disease). It is also known as ‘Rabbit Fever’ or ‘Deer Fly fever’. Properties of Francisella tularensis […]
Last updated on June 21st, 2021Burkholderia pseudomallei causes a life-threatening disease known as meliodiosis (also called Whitmore’s disease). It is glanders (caused by B. mallei) like disease in animals and humans. It affects both humans or […]
Last updated on June 21st, 2021Nocardia species are gram-positive, variably acid-fast, filamentous, and strictly aerobic organisms belonging to the actinomycetes group. Nocardia spp forms branched filaments that extend along the surface (substrate hyphae) and into […]
Last updated on May 30th, 2021Legionella is a faintly staining gram-negative pleomorphic rod, responsible for causing Legionnaires‘ disease; a severe form of atypical pneumonia, and Pontiac fever. Legionella was first recognized in 1976 after an outbreak […]
Last updated on July 4th, 2021Mycobacterium tuberculosis (MTB) is the causative agent of tuberculosis (TB) in humans. It is a slightly curved rod arranged singly or in groups. Mycobacterium tuberculosis grows very slowly, taking up […]
Last updated on June 21st, 2021Corynebacterium diphtheriae also known as Klebs-Löffler bacillus is a Gram-positive bacillus responsible for causing diphtheria. Once a major cause of illness and death among children, diphtheria became a rare disease after […]
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