👉 Infection refers to the process by which a pathogen, such as a virus, bacterium, fungus, or parasite, enters and begins to multiply within a host organism, leading to illness or disease. This occurs when the pathogen breaches the body's natural barriers, such as the skin or mucous membranes, and establishes itself in the body. Once inside, the pathogen can replicate, causing damage to cells and tissues, triggering an immune response, and potentially leading to symptoms ranging from mild discomfort to severe illness. The interaction between the pathogen and the host's immune system is a critical factor in determining the outcome of the infection, with the body's defenses playing a key role in controlling or eliminating the invader.
