What is the natural reservoir of plague?

Question

Which of the following studies are observational?
1. Case-control study
2. Cohort study
3. Randomised Controlled Trial
4. Non-randomised Trial

Answer 1

Step 1: Separate the roles of reservoir, vector and incidental host for Yersinia pestis before answering.

Step 2: The flea is the vector that carries the bacillus between hosts, so option c is out. Man is only an accidental host who does not sustain the organism in nature, so option d is out.

Step 3: That narrows it to rats. The domestic rat is the bridge that brings plague into human settlements, but the disease truly persists in wild rodent colonies as sylvatic plague.

Step 4: Since the question asks for the maintaining reservoir, the wild rat is the correct choice.

\[\boxed{\text{Wild rat}}\]

List I (Study design)	List II (Analytical outcome)
A. Case-control study	III. Odds ratio
B. Cohort study	I. Relative risk
C. Cross-sectional study	IV. Prevalence
D. Descriptive study	II. Time, place, and person distribution

List I (Screening test outcome)	List II (Meaning)
A. True-positive	I. Person has disease and screening test result is positive
B. True-negative	II. Person does not have disease and screening test result is negative
C. False-positive	III. Person does not have disease and screening test result is positive
D. False-negative	IV. Person has disease and screening test result is negative

What is the natural reservoir of plague?

Show Hint

The Correct Option is B

Solution and Explanation

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