Last updated on June 21st, 2021There are two medically important Bacillus species: Bacillus anthracis which causes anthrax, and Bacillus cereus, which causes a foodborne illness (food poisoning) similar to that of Staphylococcus. Gram Staining Gram-positive […]
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, 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 […]
Last updated on June 21st, 2021Clostridium 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 […]
Last updated on June 21st, 2021Clostridium tetani is an obligate anaerobic, gram-positive bacillus with terminal round spore (drum stick appearance). It is the causative agent of tetanus, a vaccine-preventable disease that classically follows a puncture […]
Last updated on June 21st, 2021Clostridium botulinum is gram-positive, endospore-forming bacilli which resemble a tennis racket appearance due to the presence of spores at the sub-terminal end. It produces an extremely lethal neurotoxin called botulinum […]
Last updated on June 21st, 2021Bacillus anthracis, the most notorious pathogen of the genus Bacillus, is the causative agent of a serious zoonotic disease called anthrax. Anthrax is primarily a disease of wild and domestic […]
Last updated on May 30th, 2021Clostridium perfringens is a Gram-positive, anaerobic, spore-forming rod. It produces at least 12 different toxins, which are broadly classified as “major toxins” and “minor toxins”. Certain strains also produce enterotoxin and neuraminidase. […]
Last updated on May 26th, 2021Gram-positive bacteria retain the color of the primary stain (crystal violet) in the Gram staining procedure and appear as purple/violet under a light microscope. These bacteria have a cell wall […]
Last updated on May 30th, 2021Clostridioides (formerly Clostridium) difficile causes life-threatening diarrhea. Clostridioides difficile infection (CDI) is a leading cause of hospital-associated gastrointestinal illness. This infection mostly occurs in people who have had recent medical care […]
Last updated on June 2nd, 2021Elek test is an in vitro immunoprecipitation (immunodiffusion) test to determine whether or not a strain of Corynebacterium diphtheriae is toxigenic. A test strip of filter paper containing diphtheria antitoxin […]
Last updated on June 21st, 2021Endospore staining is a differential staining technique that selectively stains the spores and makes them distinguishable from the vegetative part of the cells. Endospores are produced by a few genera […]
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