Nocardia 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...
Category: Bacteriology
Legionella pneumophila: Properties, Pathogenesis, Lab Diagnosis
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...
Laboratory Diagnosis of Mycobacterium tuberculosis Infection
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...
Corynebacterium 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,...
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...
Clostridium tetani is an obligate anaerobic, gram-positive bacillus with terminal round spore (drumstick appearance). It is the causative agent of tetanus, a vaccine-preventable disease that...