Streptococcus agalactiae: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Beta-haemolytic colony of Streptococcus agalactiae on 5% sheep blood agar of clinical specimen, High Vaginal Swab (HVS)

Introduction Streptococcus agalactiae, commonly known as Group B Streptococcus (GBS), is a Gram-positive bacterium belonging to the Streptococcaceae family. It is a significant human pathogen known for causing various infections in both adults and newborns. The bacterium is typically found as a part of the …

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

Introduction Bipolaris is a genus of filamentous fungi belonging to the family Pleosporaceae within the order Pleosporales. These fungi are commonly found in various environments, such as soil, plant debris, and decaying vegetation. Bipolaris species (they) are known to be plant pathogens, causing a range …

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Sporothrix schenckii: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Sporothrix schenckii colony morphology on SDA

Introduction Sporothrix schenckii is a dimorphic fungus and the causative agent of the infection known as sporotrichosis or “rose gardener’s disease.” It is a relatively common fungal pathogen found worldwide, and it primarily affects the skin and subcutaneous tissues, although it can occasionally spread to …

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