Treponema 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 lesions or aspirates in early-stage […]
Critical/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 the part of the ordering […]
Microbiology 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 nursing in charge should always […]
General 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 is the most common commensal […]
Last updated on May 6th, 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 […]
Francisella tularensis causes life-threatening infection 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 Causes highly infectious (as few […]
Burkholderia 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 animals (rats, rabbits, and guinea […]
Nocardia species are gram-positive, variably acid-fast, filamentous, and strictly aerobic organisms belonging to the actinomycetes group. Nocardia spp form branched filaments that extend along the surface (substrate hyphae) and into the air (aerial hyphae). They […]
Legionella 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 of pneumonia at an American […]
Mycobacterium 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 to 6 weeks for visible […]
Last updated on March 9th, 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 […]
Clostridium perfringens is a gram-positive, anaerobic, endospore-forming bacilli, often appear as boxcar shaped. It is mainly responsible for myonecrosis (gas gangrene), food poisoning, and gangrenous cholecystitis. Properties Gram staining: Gram-variable straight rods with blunt ends […]
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