Provide an example of primary prevention in a community health program.

• A. Vaccination campaigns to prevent disease.
• B. Mammography screening to detect disease early.
• C. Treatment of an existing disease.
• D. Palliative care for late-stage illness.

Answer: (A)

Primary prevention aims to stop disease before it happens by protecting people who are still healthy. Vaccination campaigns fit this because they reach healthy individuals to build immunity before exposure, preventing infection and often reducing transmission in the community. In contrast, mammography screening detects disease early after it has developed (secondary prevention), treatment of an existing disease addresses illness after it starts, and palliative care focuses on comfort for late-stage illness (tertiary prevention).