Which of the following is an example of primary prevention relevant to health?

• A. Showing a stroke patient how to walk with a cane
• B. Blood pressure screening
• C. Diabetes support group
• D. Influenza vaccination

Answer: (D)

Primary prevention aims to stop disease from occurring by reducing risk factors and boosting immunity before exposure. The influenza vaccine fits this by stimulating the immune system to prevent flu infection, thereby lowering incidence and transmission in the community.

The other options address issues after a disease process has begun or already exists: teaching a stroke patient to use a cane is rehabilitation to restore function after injury; blood pressure screening detects hypertension early to prevent complications but does not prevent the condition's onset; a diabetes support group supports ongoing management to prevent later complications, which is more about disease management and prevention of progression.

So, influenza vaccination best illustrates primary prevention.