Alcaligenes faecalis: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Alcaligenes faecalis growth on MacConkey agar

Introduction Alcaligenes faecalis is a Gram-negative, aerobic, rod-shaped bacterium primarily found in water and soil, but also as a commensal in the human intestinal tract. While it is generally nonpathogenic, it is a significant opportunistic pathogen, particularly in hospital settings where it thrives in moist …

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Aspergillus terreus: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Colony morphology of Aspergillus terreus on Corn Meal Agar (CMA) showing a characteristic cinnamon-brown to sandy-beige pigmentation with a velvety, granular texture and a light-colored peripheral growth zone

Introduction & Taxonomy Aspergillus terreus is a filamentous fungus increasingly recognized as a significant emerging opportunistic pathogen. It is uniquely distinguished from other common species by its intrinsic resistance to amphotericin B, its characteristic cinnamon-brown colony color, and the production of specialized spores called aleurioconidia. …

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Acinetobacter haemolyticus-Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Acinetobacter haemolyticus growth on CLED agar

Introduction Acinetobacter haemolyticus is an aerobic, non-fermenting bacterium found in nature and hospital environments. It belongs to the Acinetobacter genus, frequently causing healthcare-associated infections. It is generally considered less virulent than Acinetobacter baumannii but is increasingly recognized in human infections.  Morphology Pathogenicity Lab Diagnosis Treatment Prevention Keynotes Further Readings

Pichia kudriavzevii-Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Pichia kudriavzevii growth on HiCrome Candida Differential Agar

Introduction Pichia kudriavzevii, formerly known as Candida krusei, is a unique budding yeast that holds a dual status as both a critical industrial organism and an emerging opportunistic pathogen.  Taxonomy: It is the teleomorph (sexual state) of Candida krusei. It has also been historically known as Issatchenkia orientalis. …

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Klebsiella aerogenes : Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

Klebsiella aerogenes colony morphology on CLED agar after 24 hours of incubation

Introduction Klebsiella aerogenes (formerly Enterobacter aerogenes) is an opportunistic Gram-negative, facultative anaerobic bacterium responsible for serious healthcare-associated infections (HAIs), including bloodstream infections and pneumonia. It is highly associated with antibiotic resistance (including XDR strains) and poor clinical outcomes.  Morphology Pathogenicity & Virulence Factors Lab Diagnosis Treatment Prevention Keynotes …

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Rothia kristinae: Introduction, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

R. kristinae in Gram-stained culture microscopy shows irregular, pleomorphic Gram-positive bacilli, ranging from short rods to e

Introduction Pathogenicity While typically considered a low-grade commensal, it causes serious infections primarily in immunocompromised patients or those with indwelling medical devices.  Lab Diagnosis Treatment There are no official clinical breakpoints, so treatment is often guided by expert consultation and raw Minimum Inhibitory Concentration (MIC) values.  Prevention Keynotes …

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Acinetobacter ursingii: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynote

Introduction Acinetobacter ursingii is a Gram-negative, non-fermentative, opportunistic bacterium belonging to the genus Acinetobacter. It is an uncommon species compared to Acinetobacter baumannii, but it has been increasingly recognized in healthcare-associated infections (HAIs). Reported cases include bacteremia, septicemia, pneumonia, urinary tract infections, and bloodstream infections, …

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Candida albicans vs. Candida dubliniensis: Introduction, Differences, and Keynotes

Candida albicans growth on Sabouraud dextrose agar (SDA)

Introduction of Candida albicans vs. Candida dubliniensis Both Candida albicans and Candida dubliniensis are closely related yeast species belonging to the genus Candida.They share similar morphological features but differ in pathogenicity, epidemiology, and phenotypic characteristics. Differences Between C. albicans and C. dubliniensis Feature Candida albicans …

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