A person with paucibacillary leprosy has?

Appeared in: DSSSB -28 August 2019 (Shift-2)

Explanation

Paucibacillary (PB) leprosy is a form of leprosy characterized by a low bacterial load.
The World Health Organization (WHO) clinically defines PB leprosy as presenting with one to five skin lesions.
In addition to the skin lesion count, PB leprosy involves either no peripheral nerves or the involvement of only a single nerve trunk.
This option accurately combines the criteria for both skin lesions and nerve involvement for PB leprosy.

Option A: This option is too restrictive. While some paucibacillary patients have no nerve involvement, the official definition allows for the involvement of one nerve trunk.
Option B: This is the definition of Multibacillary (MB) leprosy, which is characterized by a higher bacterial load, more extensive skin lesions, and wider nerve involvement.
Option D: According to WHO classification, the presence of more than 5 skin lesions automatically categorizes the disease as Multibacillary (MB), regardless of the number of nerves involved.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain WHO Classification of Leprosy (Paucibacillary vs. Multibacillary) as background academic context rather than a clinical decision trigger.
Correctly classifying leprosy as PB or MB is the most critical step in management, as it dictates the specific drugs and duration of Multi-Drug Therapy (MDT).
PB leprosy is treated with a 6-month course of two drugs (Rifampicin and Dapsone), while MB leprosy requires a 12-month course of three drugs (Rifampicin, Clofazimine, and Dapsone).
Misclassification can lead to undertreatment (relapse, continued transmission, development of disability) or overtreatment (unnecessary drug exposure and cost).

How to Approach the Question

First, identify the key term in the question: 'paucibacillary leprosy'. The prefix 'pauci-' means 'few'.
Recall the WHO's simplified clinical classification for leprosy, which is based on two main signs: the number of skin lesions and the number of involved peripheral nerves.
Remember the cut-off numbers: Paucibacillary is 1-5 lesions and 0-1 nerves. Multibacillary is >5 lesions OR >1 nerve.
Evaluate each option against these criteria. The option that aligns with 'few' lesions (1-5) and 'few' nerves (0-1) will be the correct one.
Eliminate options that clearly describe Multibacillary leprosy (more than 5 lesions).

Concept Tested & Keywords

Concept Tested: WHO Classification of Leprosy (Paucibacillary vs. Multibacillary)
Stem keywords: paucibacillary leprosy, skin lesions, nerve involvement
Lead-in keywords: BEST, MOST RELEVANT CLUE

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E6 Medicine Harrison 22e Part 1 p. 1447-1449

Practise the full DSSSB -28 August 2019 (Shift-2)

Attempt every question from this paper in a timed mock, then review the full solution for each one.