Bacteriology

Vancomycin-Resistant Enterococcus faecium (VREfm)-Introduction, Detection Methods, and Keynotes

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Vancomycin-Resistant Enterococcus faecium (VREfm) colony morphology on CLED agar-Uropathogen

Introduction of Vancomycin-Resistant Enterococcus faecium (VREfm) Enterococcus faecium is a gram-positive, facultative anaerobic coccus that is part of the normal gastrointestinal flora but can cause nosocomial infections such as bloodstream infections, urinary tract infections, and intra-abdominal abscesses. Vancomycin-resistant Enterococcus faecium (VREfm) is defined as an isolate that harbors van …

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Biphasic Medium in Microbiology: Introduction, Application, Merit, Demerits, and Keynotes

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Biphasic Medium having bacterial growth

Introduction A biphasic medium is a culture system that combines both liquid (broth) and solid (agar) phases in the same container (usually a bottle or tube). It is designed to enhance microbial recovery by leveraging the advantages of both media types in one setup. Applications …

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Bacteria and Fungi: Introduction, Description, Demonstration Techniques, Differences, and Keynotes

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Bacteria and Fungi Introduction, Description, Demonstration Techniques, Differences, and Keynotes

Introduction of Bacteria and Fungi They are distinct types of microorganisms with different structures and characteristics. Bacteria are single-celled prokaryotes, while fungi can be single-celled (yeasts) or multicelled (molds, mushrooms) eukaryotes. They can be distinguished by their cell structure, colony morphology, and staining properties.  Description 1. Cell …

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Mycosel Agar: Introduction, Principles, Application, Keynotes, and further Readings

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Mycosel Agar Introduction, Principles, Application, Keynotes, and further Readings

Introduction Mycosel Agar is a selective culture medium to isolate pathogenic fungi from samples containing a mix of fungi and bacteria. It’s designed to suppress the growth of non-pathogenic fungi and bacteria, allowing for the isolation and identification of pathogenic fungi.  Principle Cycloheximide inhibits the growth …

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

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Acinetobacter baumannii in Gram staining of sputum

Introduction Acinetobacter baumannii is a Gram-negative, non-fermenting, aerobic coccobacillus. It is an opportunistic pathogen increasingly associated with nosocomial infections, particularly in critically ill or immunocompromised patients. Notorious for its antibiotic resistance, it has become a major global health concern, particularly in ICU settings. Morphology Pathogenicity …

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Small Colony Variants: Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

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Small Colony Variants on CLED agar

Introduction Small Colony Variants (SCVs) are a subpopulation of bacteria that grow slowly and form unusually small colonies on culture media. They are most commonly described in Staphylococcus aureus, but also occur in Pseudomonas aeruginosa, Escherichia coli, and Listeria monocytogenes. SCVs are associated with chronic, …

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

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Acinetobacter baumannii complex (ABC) colony morphology on MacConkey agar after 48 hours of incubation-Showing mucoid lactose-fermenting colonies

Introduction Acinetobacter baumannii complex is a group of Gram-negative, non-fermenting bacilli known for causing healthcare-associated infections. It includes closely related species like A. baumannii, A. pittii, A. nosocomialis, and A. calcoaceticus. This complex thrives in hospital environments and poses a serious challenge due to its …

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Proteus hauseri-Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

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Proteus hauseri colony morphology on MacConkey agar of urine culture

Introduction Proteus hauseri is a Gram-negative, facultatively anaerobic bacillus in the Enterobacteriaceae family. It is closely related to other Proteus species and commonly found in soil, water, and the human gastrointestinal tract. Though less prevalent than P. mirabilis, P. hauseri can cause opportunistic infections—especially in …

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