👉 Infection is a process where a pathogen, such as a bacterium, virus, 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 then invades tissues or organs. Once inside, the pathogen can replicate, either by hijacking the host's cellular machinery or by directly damaging cells. The immune system responds by recognizing the invader and mounting an attack, but if the infection is successful, it can lead to symptoms ranging from mild discomfort to severe illness or even death. The specific mechanisms and outcomes of infection depend on the type of pathogen and the host's immune response.
