Theories of immune response

Theories of immune response explain how our body's defenses recognize and fight infections. The clonal selection theory suggests specific immune cells are activated when they encounter a foreign invader, then multiply to fight it. The danger theory emphasizes that the immune system responds to signals indicating tissue damage or stress, rather than just foreignness. The pattern recognition theory states that immune cells identify common features of pathogens, triggering a response. Together, these theories help us understand how the immune system efficiently detects threats, learns from them, and adapts to protect the body effectively.