**Core Concept**
Disease control is a public health strategy that aims to reduce the incidence and prevalence of a disease, with the ultimate goal of eliminating the disease from a population or region. This concept is distinct from disease eradication, which involves the complete elimination of a disease worldwide.

**Why the Correct Answer is Right**
Disease control typically involves measures such as surveillance, case reporting, contact tracing, and the implementation of public health interventions to prevent the spread of the disease. The term 'disease control' often refers to the management of chronic diseases, such as diabetes or hypertension, where the disease is not completely eliminated but rather brought under control through medication and lifestyle modifications.

**Why Each Wrong Option is Incorrect**
**Option A:** Disease control does indeed involve the use of vaccines, which are a crucial tool in preventing the spread of infectious diseases. Therefore, option A is incorrect.
**Option B:** Disease control often employs a combination of individual and community-based interventions, including health education and awareness campaigns, to promote healthy behaviors and prevent the spread of disease. Thus, option B is incorrect.
**Option C:** Disease control typically refers to the management of diseases at the population level, rather than the treatment of individual patients. Therefore, option C is incorrect.

**Clinical Pearl / High-Yield Fact**
One key difference between disease control and disease eradication is that disease control often involves the management of asymptomatic carriers, whereas disease eradication requires the complete elimination of all carriers and reservoirs of the disease.

**Correct Answer: D. Treatment of individual patients.**