What happens when an individual's immune system prevents transmission?

When an individual's immune system effectively prevents transmission, it plays a crucial role in safeguarding the body from illness. The immune system is the body's defense mechanism against pathogens such as bacteria, viruses, and other foreign invaders. When it functions properly, it identifies and neutralizes these threats before they can establish an infection or cause disease. This not only protects the individual but also helps reduce the spread of infectious agents to others.

In contrast, chronic illness, increased vulnerability, and infection typically occur when the immune response is compromised or when pathogens manage to overcome the body's defenses. Thus, a robust and well-functioning immune system is essential for preventing illness and maintaining overall health.