The mode of transmission of trachoma from one person to another is?

AIIMS Raipur NO - 2017 (Shift-1)

Applied Microbiology & Infection control (E5)

Easy

Appeared in: AIIMS Raipur NO - 2017 (Shift-1)

Explanation

The primary mode of transmission for trachoma is indirect contact.
This occurs through fomites (contaminated objects like towels), fingers, and flies that carry the infectious ocular discharge from one person to another.
The bacterium Chlamydia trachomatis can survive on these surfaces and be transferred to a susceptible person's eyes.
Environmental factors like poor sanitation, lack of clean water, and crowded living conditions facilitate this mode of spread.

Option A: While direct person-to-person contact can transmit trachoma (e.g., mother to child), it is significantly less common than indirect routes of transmission.
Option C: Inoculation involves the direct introduction of a pathogen into the body's tissues, typically through a puncture or break in the skin (e.g., a needle stick or animal bite). This is not how trachoma is transmitted.
Option D: Iatrogenic transmission refers to an infection acquired as a result of a medical procedure or treatment. This is not the common way trachoma spreads within a community.

Visual 1: Infographic: A diagram illustrating the 'F-diagram' for trachoma, showing the routes from feces/eyes to a new host via Flies, Fingers, Fomites, and Fields (representing the environment).
Visual 2: Flowchart: The WHO SAFE strategy (Surgery, Antibiotics, Facial cleanliness, Environmental improvement) for trachoma control, explaining each component.
Visual 3: Image: A picture of an eye-seeking fly on a child's face to emphasize its role as a mechanical vector in trachoma transmission.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Mode of transmission of Trachoma as background academic context rather than a clinical decision trigger.
Understanding that trachoma is spread mainly by indirect contact is crucial for nurses to provide effective health education on hygiene.
Nursing interventions must focus on promoting facial cleanliness (especially in children), regular handwashing, and discouraging the sharing of personal items like towels and cloths.
The SAFE strategy (Surgery, Antibiotics, Facial Cleanliness, Environmental improvement) is the cornerstone of public health efforts to eliminate trachoma, and nurses play a key role in implementing the 'F' and 'E' components through education.

How to Approach the Question

First, identify the core concept of the question, which is the 'mode of transmission' for a specific disease, 'trachoma'.
Recall or look up the epidemiological characteristics of trachoma. Remember it's an infectious eye disease common in areas with poor sanitation.
Evaluate each option. 'Direct contact' is possible but is it the main route? 'Indirect contact' involves objects (fomites) and vectors (flies), which are strongly associated with trachoma.
Consider 'Inoculation' and 'Iatrogenic'. These are specific medical terms for transmission that don't fit the typical community spread of an eye infection like trachoma.
Conclude that indirect contact, which includes transmission by fingers, fomites, and flies, is the most comprehensive and accurate description of how trachoma spreads from person to person.

Concept Tested & Keywords

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