👉 Infection is a biological process where a pathogen, such as a bacterium, virus, fungus, or parasite, invades and establishes itself within a host organism, leading to disease. This occurs when the pathogen breaches the body's natural barriers, like the skin or mucous membranes, and begins to multiply or cause damage. The infection can trigger an immune response, where the body's defense mechanisms attempt to eliminate the pathogen, but if the infection is severe or the host's defenses are weakened, it can result in illness or even death. The corresponding aspect of infection involves the interaction between the invading pathogen and the host's cellular and molecular systems, often leading to inflammation, tissue damage, and the manifestation of symptoms characteristic of the disease.
