👉 Infection refers to the process by which a pathogen, such as a virus, bacterium, fungus, or parasite, enters 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 immune system then responds to the invasion, but if the pathogen is virulent or the host's defenses are weakened, the infection can progress, potentially causing symptoms ranging from mild discomfort to severe illness or even death. Understanding infection is crucial in public health for developing prevention strategies, treatments, and vaccines to protect individuals and communities.
