What role does a pathogen play in health and disease?

A pathogen plays a crucial role in health and disease by causing illness. Pathogens are microorganisms such as bacteria, viruses, fungi, or parasites that invade the body and disrupt normal physiological functions, leading to various diseases. The interaction between the pathogen and the host's immune system can result in symptoms ranging from mild to severe, depending on the type of pathogen and the individual's health status.

Understanding the role of pathogens is essential in fields such as medicine and public health, as it informs prevention strategies, treatment options, and the development of vaccines. Managing exposure to pathogens and understanding how they operate is integral to maintaining good health and preventing the spread of infectious diseases.