Analogy — “Skirmish : War”. Choose the pair that mirrors small/local occurrence → widespread/large-scale occurrence within the same domain.

Introduction / Context:
A “skirmish” is a minor battle; “war” is a large-scale conflict. The analogy requires the same scale relation in the health domain: an individual or local case vis-à-vis a widespread occurrence affecting many individuals.

Given Data / Assumptions:

• Skirmish : War encodes small/local : large/widespread within one domain.
• We seek a health-domain pair with the same scaling relation.

Concept / Approach:
“Disease” (or a case of disease) vs population-level spread. “Epidemic” is a widespread occurrence of a disease in a community/region. “Pandemic” is global, one step larger; the exam standard mapping from an individual occurrence is “disease → epidemic.”

Step-by-Step Solution:

Verification / Alternative check:
“Infection” is synonymous with a case or disease process, not the scaled phenomenon. “Pandemic” is also scaled-up but typically beyond “epidemic” (global); “epidemic” best mirrors “war” as the next, accepted larger scale.

Why Other Options Are Wrong:
They are either individuals, agents, or different roles, not the scaled collective phenomenon.

Common Pitfalls:
Confusing the epidemiological levels; ensure parallelism with the original scale contrast.

Final Answer:
Epidemic