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Difficulty: Very hardHuman Physiology, Health, and Diseases

In the study of human health and infectious disease epidemiology, precise identification of causative organisms and their biological vectors is critical for effective disease management. Which of the following options correctly matches the infectious disease with its causative microorganism and its primary transmission vector?

  1. Scrub Typhus �� Orientia tsutsugamushi (Bacterium) — Trombiculid miteAnswer
  2. B
    Kala-azar — Leishmania donovani (Bacterium) — Phlebotomine sandfly
  3. C
    African Trypanosomiasis — Trypanosoma brucei (Virus) — Tsetse fly
  4. D
    Kyasanur Forest Disease — Kyasanur Forest Disease Agent (Protozoan) — Hard tick

Answer

Scrub Typhus is correctly matched with its causative bacterium Orientia tsutsugamushi and its primary vector, the larval trombiculid mite.
Scrub typhus is an acute infectious zoonotic disease caused by Orientia tsutsugamushi, an obligate intracellular bacterium (formerly classified under Rickettsia). It is transmitted to humans through the bites of infected larval stage trombiculid mites (chiggers), making the disease, pathogen type, and vector combination completely accurate.

Step-by-Step Solution

1
Analyze the pathogen classification for each disease option.
Identify that Orientia tsutsugamushi is a bacterium, Leishmania donovani is a protozoan parasite, Trypanosoma brucei is a protozoan parasite, and Kyasanur Forest Disease agent is a Flavivirus.
Accurate pathogen etiology (bacterial vs viral vs protozoan) is required to eliminate misclassified options.
2
Analyze the transmission vector associated with each disease.
Scrub typhus is transmitted by trombiculid mites, Kala-azar by sandflies, Sleeping sickness by tsetse flies, and KFD by hard ticks (Haemaphysalis spinigera).
Verifying both vector and pathogen components ensures comprehensive matching accuracy.
3
Cross-reference pathogen type and vector for all choices.
Only the pairing of Scrub Typhus with Orientia tsutsugamushi (Bacterium) and Trombiculid mite is entirely correct in both pathogen nature and vector type.
The other options misidentify the biological kingdom/nature of the causative pathogen.

Key Concept

Classification of infectious human diseases by pathogen etiology (bacterial, viral, protozoan) and biological vectors
Estimated Time:1m 30s
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Topics

Human Physiology, Health, and Diseases

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