👉 Infection refers to the process by which a pathogen, such as a virus, bacterium, fungus, or parasite, enters and takes control of a living host, typically causing disease. This occurs when the pathogen breaches the body's natural barriers, like the skin or mucous membranes, and begins to multiply or interact with host cells. The interaction can lead to various symptoms, from mild discomfort to severe illness, depending on the type of pathogen and the host's immune response. For example, a bacterial infection might cause inflammation and tissue damage, while a viral infection could result in cell dysfunction or even cell death. The body's immune system then responds by fighting off the invader, aiming to eliminate the pathogen and restore health. However, if the infection is severe or the immune system is compromised, it can lead to complications or chronic conditions.
