👉 Infection is an invasion by pathogenic microorganisms—such as bacteria, viruses, fungi, or parasites—into a host organism, disrupting normal cellular functions and leading to disease. This process begins when these microorganisms breach the body's defenses, often through breaches in physical barriers like skin or mucous membranes. Once inside, they multiply and can cause damage by releasing toxins, consuming host nutrients, or triggering an immune response that may lead to inflammation and tissue injury. Effective infection prevention involves maintaining hygiene, vaccination, and timely medical intervention to control the spread of pathogens.
