👉 Infection is a complex biological process where a pathogen, such as a bacterium, virus, fungus, or parasite, enters a host and begins to multiply, often causing disease. This occurs when the pathogen breaches the body's natural barriers, like the skin or mucous membranes, and establishes itself within the host's tissues or bloodstream. The interaction between the pathogen and the host's immune system is crucial; while the immune system attempts to neutralize the invader, the pathogen may evade or manipulate these defenses, leading to infection. Infection can result in a range of outcomes, from mild symptoms like a cold to severe conditions such as sepsis or organ failure, depending on factors like the pathogen's virulence, the host's immune status, and the site of infection. Effective treatment often involves targeting the pathogen directly or bolstering the body's defenses to combat the infection.
