RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024
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Which epidemiological study design is used to investigate disease outbreaks
Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024
Explanation
- Case-control studies are a type of analytical, observational study designed to work backward from effect (disease) to cause (exposure).
- This retrospective approach is ideal for outbreak investigations because it allows public health officials to quickly identify potential sources by comparing the past exposures of sick individuals (cases) to those of healthy individuals (controls).
- It is particularly efficient for rare diseases or outbreaks where the total population at risk is unknown or large.
- The key is comparing the odds of exposure in cases versus controls to find a statistical association, pointing to the likely source of the outbreak.
Why Other Options Were Wrong
- Option A: A cohort study follows a group (cohort) over time to see who develops a disease. While a retrospective cohort study can be used in outbreaks, it's only practical when the entire exposed group is small and easily identifiable (e.g., all guests at a party). It is generally more time-consuming and less efficient than a case-control study for widespread outbreaks.
- Option C: A cross-sectional study takes a 'snapshot' of a population at a single point in time, measuring the prevalence of a disease and exposures simultaneously. It cannot determine if the exposure preceded the disease, which is essential for establishing causation in an outbreak.
- Option D: A descriptive study is the necessary first step in an outbreak investigation, but it does not analytically test for a cause. It involves collecting data on the time, place, and person affected to describe the outbreak and generate hypotheses about the potential source.
Related Visual
Clinical Relevance
- Nursing practice connection: Knowing Application of epidemiological study designs in the context of disease outbreak investigations helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
- Nurses, particularly those in community and public health, play a vital role in outbreak investigations by identifying cases, collecting patient data, and implementing control measures.
- Understanding the difference between study designs helps nurses interpret public health alerts and research findings accurately.
- A nurse's ability to collect precise patient histories (including food, travel, and contact history) is critical for the success of a case-control study.
How to Approach the Question
- First, identify the core task in the question: 'investigate disease outbreaks'. This implies a need for a rapid method to find a cause.
- Next, review the purpose of each study design option.
- Recall that 'descriptive' studies only describe, they don't test for a cause.
- Recall that 'cross-sectional' studies are a snapshot in time and can't establish a cause-and-effect timeline.
- Differentiate between 'cohort' and 'case-control'. Cohort studies move from cause to effect (forward-looking), while case-control studies move from effect to cause (backward-looking).
- Conclude that for a sudden outbreak, looking backward from the sick people (cases) to find a common cause is the most logical and efficient approach, which defines a case-control study.
Concept Tested & Keywords
- Concept Tested: Application of epidemiological study designs in the context of disease outbreak investigations.
- Stem keywords: epidemiological study design, investigate, disease outbreaks
- Lead-in keywords: Which
Question ID
QYNt07sDcECdwlNOrPwxYB
Reference Book
E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 2846-2848
E6 NursingResearch Suresh Sharma 5e Part 1 p. 182-184
E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 69-71
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