Chlamydia trachomatis: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Introduction Chlamydia trachomatis is a gram-negative bacterium and is an important human pathogen known for causing several diseases. It is an obligate intracellular bacterium, meaning it can only survive and reproduce inside host cells. C. trachomatis primarily infects epithelial cells of the mucous membranes in …

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Corynebacterium diphtheriae: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Corynebacterium diphtheriae colony morpholoy on 5% sheep blood agar after 48 hours of incubation

Introduction Corynebacterium diphtheriae is a gram-positive, rod-shaped bacterium that causes diphtheria, a highly contagious and potentially life-threatening respiratory infection. This bacterium was first identified and described by the German physician Edwin Klebs in 1883, and later confirmed by Friedrich Loeffler and Emil von Behring. The …

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Mycoplasma hominis: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Introduction Mycoplasma hominis is a species of bacteria belonging to the Mollicutes class. It is a unique microorganism as it lacks a cell wall, making it one of the smallest self-replicating organisms known. Due to this feature, it has a pleomorphic appearance, taking various shapes, …

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Escherichia coli: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Greenish metallic sheen of Escherichia coli on Eosin Methylene Blue (EMB) Agar

Introduction Escherichia coli, often abbreviated as E. coli, is a gram-negative, rod-shaped bacterium belonging to the Enterobacteriaceae family. It is one of the most commonly studied and well-known bacteria, both because of its importance in scientific research and its relevance in various aspects of human …

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Citrobacter koseri: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Mucoid colony of Citrobacter koseri on CLED agar of urine specimen

Introduction Citrobacter koseri, formerly known as Citrobacter diversus, is a gram-negative bacterium belonging to the Enterobacteriaceae family. It is a facultative anaerobe, meaning it can grow both in the presence and absence of oxygen. The species name “koseri” is a tribute to the bacteriologist Leo …

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Scabies: Introduction, Sign and Symptoms, Laboratory Diagnosis, Treatment, Prevention and Control, and Keynotes

Introduction Scabies is a common and contagious skin infestation caused by the microscopic mite Sarcoptes scabiei. It is prevalent worldwide and can affect people of all ages and socioeconomic backgrounds. Scabies mites burrow into the top layer of the skin, where they lay eggs and …

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Trichomonas vaginalis: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Introduction Trichomonas vaginalis is a parasitic protozoan that primarily infects the urogenital tract of humans, causing the sexually transmitted infection (STI) known as trichomoniasis. This microorganism is responsible for one of the most common curable STIs worldwide. T. vaginalis was first identified by Alfred Francois …

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Malassezia: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Gram-positive to variable yeast cells and short hyphae of Malassezia in Gram staining of culture

Introduction Malassezia is a genus of yeast-like fungi that belongs to the class Malasseziomycetes. These fungi are part of the normal skin microbiota of humans and other animals, commonly found on the skin surfaces, particularly in sebum-rich areas such as the scalp, face, chest, and …

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