Which of the following disease is caused by rat flea?

NORCET 3 - 2022 (Shift-2)

Applied Microbiology & Infection control

Easy

Appeared in: NORCET 3 - 2022 (Shift-2)

Explanation

Endemic typhus, also known as murine typhus, is the disease caused by the bacterium Rickettsia typhi.
It is transmitted to humans primarily by the Oriental rat flea, Xenopsylla cheopis.
Infection occurs when infected flea feces are rubbed into the flea bite site or other small breaks in the skin.
The classic reservoir for R. typhi is the rat, making the rat flea the key vector in its transmission cycle.

Option A: Rocky Mountain spotted fever is a tick-borne disease, not flea-borne. It is caused by Rickettsia rickettsii.
Option B: Sleeping sickness, or African trypanosomiasis, is a parasitic disease transmitted by the bite of an infected tsetse fly (Glossina species). It is not caused by a bacterium or transmitted by fleas.
Option C: Epidemic typhus is transmitted by the human body louse (Pediculus humanus corporis), not the rat flea. Although it is also a rickettsial disease (Rickettsia prowazekii), its vector and epidemiology are distinct.

Visual 1: Diagram - A chart showing common vector-borne diseases, their causative agents, and the specific arthropod vectors (flea, louse, tick, mosquito, tsetse fly) that transmit them.

Clinical Relevance

Nursing practice connection: Knowing Vector-borne diseases and their specific arthropod vectors helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Identifying the correct vector is crucial for public health officials to implement effective control measures, such as rodent and flea control for endemic typhus, or delousing for epidemic typhus.
A patient's travel and exposure history (e.g., contact with rats, recent camping, travel to Africa) is a key part of the diagnostic process for febrile illnesses with a rash.
What if? If the patient presented with a similar rash and fever but had recently been in an overcrowded, unhygienic refugee camp, the primary suspicion would shift to epidemic (louse-borne) typhus, not endemic (flea-borne) typhus.

How to Approach the Question

First, identify the key terms in the question: 'disease' and 'rat flea'.
This is a factual recall question that tests your knowledge of microbiology and infectious diseases, specifically vector-borne illnesses.
Systematically review the options. For each disease, recall its specific mode of transmission.
Recall or deduce that 'Endemic typhus' is classically associated with rats and their fleas.
Differentiate it from 'Epidemic typhus', which is associated with human body lice, often in settings of poor hygiene and crowding. The names themselves can be a clue: 'endemic' suggests a stable presence in an animal reservoir, while 'epidemic' suggests rapid human-to-human spread.
Eliminate the other options by recalling their vectors: ticks for Rocky Mountain spotted fever and tsetse flies for sleeping sickness.

Concept Tested & Keywords

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