👉 Infection is an invasion of the body by pathogens, such as bacteria, viruses, fungi, or parasites, which disrupt normal cellular functions and cause disease. When these pathogens breach the body's natural barriers—like the skin or mucous membranes—they can multiply and spread, leading to infection. The immune system typically responds by recognizing and attacking these invaders, but if the pathogen is highly virulent or the host's defenses are weakened, the infection can progress. This process involves the release of inflammatory responses, tissue damage, and sometimes systemic effects, depending on the type and location of the infection. Understanding infection is crucial for developing treatments and preventive measures to protect health and prevent the spread of disease.
