Which of the following disease is caused by the rat flea?

Appeared in: NORCET 3 - 2022 (Shift-1)

Explanation

Murine typhus, also known as endemic or flea-borne typhus, is a bacterial infection caused by Rickettsia typhi.
The primary vector for this disease is the Oriental rat flea (Xenopsylla cheopis).
Humans are infected when feces from an infected flea contaminate a bite wound or mucous membranes.
The classic cycle involves rats as the main animal reservoir and rat fleas as the vector.

Option B: Sleeping sickness is a parasitic disease, not bacterial, and its vector is the tsetse fly, not a flea.
Option C: Rocky Mountain spotted fever is transmitted by the bite of infected ticks, not fleas.
Option D: Epidemic typhus is transmitted by the human body louse (Pediculus humanus corporis), which thrives in conditions of poor hygiene and crowding.

Visual 1: Infographic: A chart showing four arthropod vectors (rat flea, tsetse fly, tick, body louse) with arrows pointing to the respective diseases they transmit (Murine Typhus, Sleeping Sickness, RMSF, Epidemic Typhus).
Visual 2: Diagram: The transmission cycle of Murine typhus, illustrating the roles of the rat reservoir, the rat flea vector, and the human host.

Clinical Relevance

Nursing practice connection: Knowing Vector-Borne Diseases helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses play a vital role in community health by educating the public on preventing vector-borne diseases. This includes teaching about rodent control, proper waste disposal, and using flea control products for pets.
In a clinical setting, a nurse obtaining a patient history should inquire about recent travel, exposure to animals (like rats, opossums, cats), and potential flea bites if a patient presents with unexplained fever, headache, and rash.
What if? If a patient from a crowded refugee camp presents with high fever and a rash, the nurse should have a higher index of suspicion for Epidemic (louse-borne) typhus rather than Murine (flea-borne) typhus due to the different epidemiological risk factors.

How to Approach the Question

First, identify the key terms in the question stem: 'disease' and 'rat flea'. The question is asking for a direct link between a specific vector and a disease.
This is a factual recall question. You need to access your knowledge of microbiology and infectious diseases.
Systematically evaluate each option:
A. Murine typhus: Recall or deduce its vector. Is it the rat flea?
B. Sleeping sickness: Recall its vector. Is it the rat flea?
C. Rocky Mountain spotted fever: Recall its vector. Is it the rat flea?

Concept Tested & Keywords

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Practise the full NORCET 3 - 2022 (Shift-1)

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