👉 Infection occurs when a pathogen, such as a bacterium, virus, fungus, or parasite, enters the body and begins to multiply, often exploiting the host's own cells or tissues for survival and reproduction. This process starts with the pathogen breaching the body's natural barriers, like the skin or mucous membranes, and then either attaches to specific receptors on host cells or is taken up through endocytosis. Once inside, the pathogen can replicate, sometimes causing direct damage to host cells or triggering an immune response that leads to inflammation. If the infection is not contained, it can spread to other parts of the body, leading to systemic illness. The body's immune system then fights back, but in some cases, the pathogen may evade or overwhelm the defenses, resulting in symptoms and potential complications. Realistic infections are characterized by a gradual onset of symptoms, varying depending on the pathogen and the individual's health status, and often require specific treatments to clear the infection and prevent further damage.
