👉 Infection is a biological process where a pathogen, such as a bacterium, virus, or parasite, invades a host and begins to multiply, often causing disease. The operation of infection involves several key steps: first, the pathogen must enter the host, typically through breaches in physical barriers like skin or mucous membranes; once inside, it must evade or overcome the host's immune defenses. The pathogen then adheres to and colonizes specific tissues or organs, where it can multiply rapidly. This multiplication can lead to damage of host cells and tissues, triggering an immune response aimed at eliminating the invader. However, if the pathogen is successful, it can establish an infection, leading to symptoms and potential complications. The body's defense mechanisms, including inflammation and the production of antibodies, play crucial roles in controlling and eventually clearing the infection.
