👉 Infection is a biological process where a pathogen, such as a bacterium, virus, fungus, or parasite, invades and multiplies within a host organism, disrupting normal cellular functions and causing disease. This invasion typically occurs when the pathogen breaches the body's natural barriers, like the skin or mucous membranes, and enters the bloodstream or tissues. Once inside, the pathogen can replicate, leading to symptoms such as inflammation, tissue damage, and immune system activation. The body's immune response attempts to combat the infection by producing antibodies and activating immune cells, but if the pathogen is too virulent or the host's defenses are weakened, the infection can persist or lead to severe illness. Understanding infection is crucial for developing treatments and preventive measures, such as antibiotics, antivirals, vaccines, and hygiene practices.
