👉 Infection refers to the process by which a pathogen, such as a virus, bacterium, or parasite, enters and establishes itself within a host organism, leading to disease. This occurs when the pathogen breaches the body's natural barriers, such as the skin or mucous membranes, and begins to multiply or cause damage. Infection can result in a range of symptoms, from mild irritation to severe illness, depending on the type of pathogen and the host's immune response. The body's immune system plays a crucial role in fighting off infections, but sometimes the pathogen can evade or overwhelm these defenses, leading to complications. Understanding infection is fundamental in fields like medicine and public health, as it informs strategies for prevention, diagnosis, and treatment.
