👉 The concept of contagiousness is a biological principle that describes how an infectious agent can spread from one person to another. This means that when an organism, such as a virus or bacteria, comes into contact with a susceptible host (such as a human), it can transfer its genetic material and cause the host to become infected. This process can be contagious because an individual's immune system is triggered by the presence of the infectious agent, which triggers a response in their body. The more frequently this occurs,
