Which of the following should be included as physical agents when discussing work-related illness?

Physical agents refer to elements in the environment that can cause physical harm or illness to workers. In the context of work-related illnesses, lighting as a physical agent addresses the quality of illumination in the workplace and how it can impact workers' health and safety. Poor lighting can lead to visual discomfort, increase the risk of accidents, and contribute to stress and fatigue. Adequate lighting is essential not only for visibility but also for promoting an ergonomic environment that can enhance productivity and reduce the likelihood of errors.

In contrast, viruses are biological agents, age is a demographic factor that may influence susceptibility to health issues but does not directly relate to physical environmental hazards, and stress, while a significant factor impacting health, is considered more of a psychological or emotional agent rather than a physical one. These distinctions clarify why lighting is the most relevant option related to physical agents in the context of work-related illnesses.