Which of the following activities is part of secondary prevention?

Secondary prevention focuses on early detection and prompt intervention to prevent the progression of disease. This approach is critical for managing conditions that have already manifested but where early treatment can lead to better outcomes. Activities such as early detection and treatment of disease fall squarely within this category, as they aim to identify health problems at their earliest stages when they are often more manageable and less severe.

In the context of the options presented, early detection and treatment of disease is the hallmark of secondary prevention. It involves screening and diagnostic tests that aim to catch diseases before they develop further or cause significant health issues, thereby allowing timely medical interventions.

Other activities, while important for overall public health, do not fit the definition of secondary prevention. For example, immunization programs are a form of primary prevention aimed at preventing diseases before they occur. Health education workshops also align more with primary prevention as they focus on promoting healthy behaviors to prevent the onset of diseases. Community health screenings, while they might seem related to early detection, are generally categorized based on the nature of their implementation; for instance, if they are aimed at screening for diseases, they could be considered a secondary prevention strategy, though they are not as direct as the activity of early detection and treatment itself.