In terms of disease transmission, what is a pathogen?

A pathogen is defined as an organism that causes diseases. This includes various types of microorganisms such as bacteria, viruses, fungi, and parasites that can invade the body and disrupt normal physiological functions, leading to illness. The presence of a pathogen can trigger a complex immune response as the body works to eliminate the invader and restore health.

Understanding the role of pathogens is crucial in the study of disease transmission, as it highlights the importance of hygiene, vaccination, and other preventive measures to reduce the risk of infection. Recognizing what constitutes a pathogen enables individuals to better understand how diseases spread and the importance of taking proactive health measures.