Which of the following infections are NOT acquired through a thorn prick injury?

INI-CET EXAM -2025

Applied Microbiology & Infection control

Easy

Appeared in: INI-CET EXAM -2025

Explanation

Dermatophytosis is a superficial fungal infection affecting the outermost layers of the skin, hair, and nails.
It is commonly known as ringworm, tinea, or athlete's foot.
Transmission occurs through direct person-to-person contact, contact with infected animals, or via contaminated objects (fomites) like towels and floors.
This mode of transmission is contact-based, not through deep, penetrating trauma like a thorn prick.

Option B: Chromoblastomycosis is a subcutaneous mycosis. The fungi causing it are found in soil and on plant material, and infection occurs following traumatic inoculation into the skin.
Option C: Mycetoma (Madura foot) is a chronic, deep subcutaneous infection. The causative agents (fungi or actinomycetes) are implanted into the tissue through minor trauma, such as a thorn prick.
Option D: Sporotrichosis is famously known as 'rose gardener's disease' precisely because it is often acquired when the fungus Sporothrix schenckii, living on plants like roses, enters the skin through a thorn prick.

Visual 1: Table - A comparative table showing Superficial vs. Subcutaneous Mycoses, highlighting their causative agents, mode of transmission, and clinical presentation.
Visual 2: Diagram - A cross-section of the skin illustrating the difference between a superficial infection (like dermatophytosis) confined to the epidermis and a subcutaneous infection (like sporotrichosis) extending into the dermis and subcutaneous tissue.

Clinical Relevance

Nursing practice connection: Knowing Modes of transmission for different types of fungal infections (mycoses) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
A key nursing skill is taking a thorough patient history, including occupation and hobbies. For a patient with an unusual skin lesion, asking about activities like gardening, farming, or landscaping can provide crucial clues for diagnosing subcutaneous mycoses like sporotrichosis.
Patient education is vital. Nurses should advise individuals who work with soil and plants (e.g., gardeners, farmers) to wear protective clothing, such as gloves and boots, to prevent traumatic inoculation of fungi.
What if? If a patient who is a rose gardener presents with a small, painless papule on their hand that later ulcerates, with a chain of similar nodules appearing along the arm's lymphatic drainage path, the diagnosis is almost certainly lymphocutaneous sporotrichosis, not dermatophytosis.

How to Approach the Question

First, identify the negative framing of the question with the word 'NOT'. This means you are looking for the option that does not fit the described category.
The key mechanism described is 'thorn prick injury'. This implies a deep, penetrating trauma that introduces an infectious agent into the subcutaneous tissue.
Review each option and classify its typical mode of transmission.
Recall or determine that Sporotrichosis, Mycetoma, and Chromoblastomycosis are all subcutaneous mycoses associated with traumatic inoculation from soil or plants.
Identify that Dermatophytosis is a superficial infection spread by contact, not by deep injury.
Select Dermatophytosis as the correct answer because it is the exception.

Concept Tested & Keywords

Concept Tested: Modes of transmission for different types of fungal infections (mycoses).
Stem keywords: infections, acquired through, thorn prick injury
Lead-in keywords: NOT
Negative lead-in flag: The question asks to identify the infection that is NOT transmitted in a specific way.

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