infectious agent theory

The infectious agent theory suggests that some diseases are caused by microorganisms like bacteria, viruses, or fungi that invade the body. These tiny agents can disrupt normal body functions, leading to illness. The theory is supported by evidence showing how these agents spread between individuals and cause specific diseases. Understanding this helps in preventing, diagnosing, and treating infections, as targeting the infectious agents can eliminate or control the disease. Overall, it emphasizes the role of microorganisms as primary culprits in many health conditions.