All of the following are the diseases commonly transmitted

by lice, EXCEPT:

Appeared in: UPPSC 2017

Explanation

Giardiasis is the correct answer as it is not transmitted by lice.
It is an intestinal infection caused by a protozoan parasite, Giardia lamblia.
Transmission occurs through the fecal-oral route, typically by ingesting contaminated water or food, not through an insect vector like a louse.

Option A: Epidemic typhus is a classic louse-borne disease caused by the bacterium Rickettsia prowazekii. It is transmitted by the human body louse.
Option C: Louse-borne relapsing fever is caused by the spirochete Borrelia recurrentis and is transmitted from person to person by the human body louse.
Option D: Trench fever is caused by the bacterium Bartonella quintana. The vector is the human body louse, and the disease is transmitted through its feces.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Modes of disease transmission (vector-borne vs. waterborne) as background academic context rather than a clinical decision trigger.
Understanding different transmission routes is fundamental for nurses to implement correct infection control precautions (e.g., standard/contact precautions for giardiasis vs. delousing procedures for louse-borne diseases).
Patient education on hygiene is a key nursing role. For giardiasis, education focuses on safe water and food practices. For louse-borne diseases, it centers on personal hygiene, laundering of clothes and bedding, and avoiding overcrowded conditions.
What if? - If a patient from a refugee camp or disaster area presents with high fever, headache, and a rash, the nurse's assessment should include questions about exposure to lice, as louse-borne diseases like typhus are a significant risk in such settings.

How to Approach the Question

First, identify the core subject of the question, which is 'diseases transmitted by lice'.
Note the keyword 'EXCEPT'. This signals that you must find the option that does NOT belong to the group.
Systematically evaluate each option based on its primary mode of transmission.
Recall or deduce that epidemic typhus, relapsing fever, and trench fever are all historically and epidemiologically linked to lice, often in conditions of poor hygiene and overcrowding.
Identify 'giardiasis' as a common gastrointestinal illness primarily associated with contaminated water (a waterborne, fecal-oral route).
Conclude that giardiasis is the outlier and therefore the correct answer to this 'EXCEPT' question.

Concept Tested & Keywords

Concept Tested: Modes of disease transmission (vector-borne vs. waterborne)
Stem keywords: diseases, transmitted, lice
Lead-in keywords: EXCEPT
Negative lead-in flag: The question uses the word 'EXCEPT', asking you to identify the option that does not fit the described category (diseases transmitted by lice).

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart B (pp 202-403 of 604) p. 165-167

E6 Medicine Davidson Principles Practice 24e p. 277-279

Practise the full UPPSC 2017

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