👉 Infection is a biological process where pathogens, such as bacteria, viruses, fungi, or parasites, invade and multiply within a host organism, leading to disease. This occurs when these microorganisms breach the body's natural barriers—like the skin or mucous membranes—and establish themselves in tissues or organs. The host's immune system then responds, often initiating an inflammatory reaction to combat the invaders. However, if the pathogen is highly virulent or the host's defenses are weakened, the infection can progress, causing symptoms ranging from mild discomfort to severe illness or even death. Understanding infection is crucial for developing effective prevention strategies, treatments, and vaccines to protect public health.
