Basic Microbiology

HiCrome Candida Differential Agar: Introduction, Principle, Test Requirement, Procedure, Result-Interpretation, and Keynotes

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Various Candida species growth on HiCrome Candida Differential Agar after 4 days of incubation

Introduction HiCrome™ Candida Differential Agar is a specialized chromogenic medium used in clinical microbiology for the rapid isolation and presumptive identification of Candida species. The medium is designed to differentiate between major Candida species—Candida albicans, Candida tropicalis, Candida krusei (Pichia kudriavzevii), and Candida glabrata—based on colony color and morphology within 48 hours. …

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Dalmau Plate Technique: Introduction, Principle, Test Requirements, Procedure, Application, and Keynotes

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Dalmau Plate Microscopy at high power field (40X objective)

Introduction The Dalmau plate technique is a classic mycological method used to identify and differentiate yeast species, specifically Candida species, by observing their unique morphological features.  The technique is a specialized culture method that uses a “starvation medium” to induce the formation of characteristic structures like pseudohyphae, blastoconidia, and chlamydospores. It remains …

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

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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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Serpentine Cord: Introdction, Clinical Significance, and Keynotes

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Serpentine cord or Cord factor or Trehalose dimycolate,TDM of Mycobacterium tuberculosis complex (MTBC) in Ziehl-Neelsen Staining of modified Middlebrook 7H9 Broth at a magnification of 1600X

Introduction Clinical Significance Keynotes Further Readings

Lactococcus garvieae: Introduction, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes

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Gram positive cocci of Lactococcus garvieae in Gram staining of repeated culture at a magnification of 4000X

Introduction Lactococcus garvieae is a Gram-positive, catalase-negative, non-spore-forming coccus, typically arranged in pairs or short chains. It belongs to the lactic acid bacteria group and is well known as a major pathogen in fish (lactococcosis). In humans, it is an emerging opportunistic pathogen, increasingly recognized …

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BAL Sample vs Sputum Sample – Key Differences

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BAL Sample vs Sputum Sample – Key Differences

Bronchoalveolar Lavage (BAL) and sputum are commonly used respiratory specimens. Still, they differ significantly in terms of source, quality, diagnostic value, and clinical utility, especially in patients with tuberculosis, fungal infections, pneumonia, and oncology. Basic Definition Feature BAL Sample Sputum Sample Definition Expectorated respiratory secretion …

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Streptococcus agalactiae (GBS): Introduction, Pathogenicity, Lab Diagnosis, Treatment, and Keynotes

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Gram-positive cocci in chains Streptococcus agalactiae (GBS)

Introduction Streptococcus agalactiae, also known as Group B Streptococcus (GBS), is a Gram-positive, beta-hemolytic coccus arranged in chains. It is a major cause of neonatal sepsis, meningitis, and infections in pregnant women, and an emerging pathogen in immunocompromised adults. GBS commonly colonizes the gastrointestinal and …

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Fungal Elements in KOH Mount of Pleural Fluid Microscopy-Introduction, Possible Fungi Observed in Pleural Fluid KOH Mount, Applications, and Keynotes

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Fungal Elements in KOH Mount of Pleural Fluid Microscopy-Introduction, Possible Fungi Observed in Pleural Fluid KOH Mount, Applications, and Keynotes

Introduction KOH Mount of Pleural Fluid is a rapid, direct microscopic test used to detect fungal elements in suspected pleural infections. A 10–20% Potassium Hydroxide (KOH) solution clears cellular debris, fibrin, and protein content in pleural fluid while preserving chitin-rich fungal structures such as hyphae, …

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