👉 Infection refers to the process by which a pathogen, such as a virus, bacteria, fungus, or parasite, enters and begins to multiply within a host organism, typically causing disease. This occurs when the pathogen breaches the body's natural barriers, like the skin or mucous membranes, and establishes itself in tissues or organs. Once inside, the pathogen can replicate, potentially harming host cells and triggering an immune response. This interaction between the invading agent and the host's defenses can lead to symptoms ranging from mild discomfort to severe illness, depending on the type of pathogen and the individual's health status. Understanding infection is crucial for developing treatments and preventive measures to combat diseases.
