Yeasts E-Test: Introduction, Principle, Clinical Significance, and Keynotes

Yeasts E-Test- Introduction, Principle, Clinical Significance, and Keynotes

Introduction Yeast infections, particularly caused by Candida and Cryptococcus species, are a major clinical challenge, especially in immunocompromised patients. Rapid and accurate determination of antifungal susceptibility is crucial for guiding therapy. The E-test (Epsilometer test) is a widely used, simple, and reliable method for determining …

Read more

Multiplex PCR Assay-Directly on Blood for Fungi: Introduction, Principle, Clinical Significance, and Keynotes

Introduction Fungal bloodstream infections (fungemia) are life-threatening, especially in immunocompromised and oncology patients. Conventional methods like blood culture are slow, often requiring several days for growth and identification. Multiplex PCR directly on blood offers rapid, sensitive, and simultaneous detection of multiple fungal pathogens without the …

Read more

β-D-Glucan: Introduction, Principle, Clinical Significance, and Keynotes

Introduction β-D-Glucan (BDG) is a polysaccharide component of the fungal cell wall, widely present in species such as Candida, Aspergillus, Fusarium, and Pneumocystis jirovecii. Since it is released into the bloodstream during invasive fungal infections (IFIs), detection of BDG has become a valuable non-culture-based diagnostic …

Read more

Blood Culture–Positive Yeasts: Introduction, Common molds, Comparison, and Keynotes

Gram-positive budding yeast-like cells, oval to elongated, arranged singly, in pairs, and in short pseudohyphae-like forms in Gram staining of culture microscopy at a magnification of 4000X

Introduction Unlike molds, yeasts are the most commonly recovered fungi in blood cultures. Candidemia is among the leading causes of bloodstream infections in immunocompromised and critically ill patients. Yeasts such as Candida, Cryptococcus, and Trichosporon are responsible for significant morbidity and mortality. Blood culture positivity …

Read more

Blood Culture–Positive Molds: Introduction, Common molds, Comparison, and Keynotes

Blood Culture–Positive Molds

Introduction Blood cultures are the cornerstone for diagnosing fungemia, but while yeasts (Candida spp.) are frequently detected, molds are rarely recovered in blood culture systems. This is because most molds (Aspergillus, Mucorales) cause tissue-invasive disease without sustained fungemia. However, certain molds such as Fusarium spp. …

Read more

Fungal Identification by PCR-Sequencing (Sanger): Introduction, Principle, Clinical Significance, and Keynotes

Pure culture of Candida

Introduction Accurate identification of fungi is critical for clinical, environmental, and epidemiological purposes. Traditional culture and morphology-based methods are time-consuming and may misidentify cryptic or closely related species. PCR amplification followed by Sanger sequencing of conserved genetic loci (e.g., ITS, 18S rRNA, 28S rRNA, β-tubulin, …

Read more

Yeast Identification by MALDI-TOF (VITEK): Introduction, Principle, Clinical Significance, and Keynotes

Yeast Identification by MALDI-TOF (VITEK): Introduction, Principle, Clinical Significance, and Keynotes

Introduction Yeasts, especially Candida species, are among the most important causes of opportunistic fungal infections in humans. Accurate and rapid identification is crucial for guiding antifungal therapy and improving patient outcomes. Traditional phenotypic methods are time-consuming and often misidentify cryptic species. Matrix-Assisted Laser Desorption/Ionization Time-of-Flight …

Read more

Candida auris PCR-Directly on Clinical Samples: Introduction, Principle, Clinical Significance, and Keynotes

Candida auris PCR-Directly on Clinical Samples: Introduction, Principle, Clinical Significance, and Keynotes

Introduction Candida auris is an emerging multidrug-resistant yeast responsible for outbreaks of healthcare-associated infections worldwide. It is difficult to identify by conventional culture and biochemical methods, often misidentified as other Candida species (C. haemulonii, C. famata). Rapid and accurate detection is essential to initiate infection …

Read more