Identify species from below given phenomenon& x20; - INI-CET EXAM -2025

INI-CET EXAM -2025

Applied Microbiology & Infection control

Easy

Appeared in: INI-CET EXAM -2025

Explanation

The image shows a positive germ tube test, which is a rapid diagnostic method used in microbiology.
The structure seen is a germ tube—a short, non-septate hyphal extension originating from a yeast cell without any constriction at its base.
This specific morphological feature is a classic and reliable characteristic for the presumptive identification of Candida albicans.

Option B: Candida parapsilosis is germ tube negative. It does not form the filamentous outgrowth seen in the image under the conditions of the germ tube test.
Option C: Candida kruzei is germ tube negative. Its microscopic morphology is distinct, often showing elongated, "matchstick"-like cells.
Option D: Candida tropicalis is typically germ tube negative. While rare strains might produce similar structures, it is not a consistent or reliable feature for its identification. The germ tube test is not the standard method to identify C. tropicalis.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification of Candida species based on microscopic morphology as background academic context rather than a clinical decision trigger.
The germ tube test is a simple, rapid (results in 2-4 hours), and cost-effective method for the presumptive identification of C. albicans, the most common cause of candidiasis (yeast infections).
Rapid identification is crucial for initiating appropriate antifungal therapy, especially in immunocompromised patients where invasive candidiasis can be life-threatening.
What if the germ tube test was negative? If the test is negative, the laboratory would proceed with other tests, such as biochemical assays or culture on chromogenic agar, to identify the specific non-albicans Candida species, as they can have different antifungal susceptibility patterns.

How to Approach the Question

First, carefully examine the provided microscopic image to identify the key morphological features.
Recognize the main structure: a round yeast cell giving rise to a tube-like extension.
Note the specific characteristic of this extension: there is no pinch or constriction where it emerges from the parent cell. This identifies it as a germ tube.
Recall or deduce that the formation of a germ tube is the principle of the 'Germ Tube Test'.
Access your knowledge of medical mycology to remember which Candida species is primarily identified by a positive germ tube test.
Compare this knowledge with the given options to select Candida albicans as the correct answer.

Concept Tested & Keywords

Concept Tested: Identification of Candida species based on microscopic morphology.
Stem keywords: Identify species, phenomenon, microscopic image
Lead-in keywords: Identify

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