👉 Infection occurs when a pathogen, such as a virus or bacteria, enters the body and begins to multiply or cause harm to cells and tissues. This process starts when the pathogen breaches the body's natural defenses, like the skin or mucous membranes, and then invades the body's cells or tissues. Once inside, the pathogen can replicate rapidly, leading to symptoms like fever, inflammation, and disease. The immune system typically fights back by recognizing and attacking the invader, but if the infection is severe or the pathogen is particularly virulent, it can overwhelm the body's defenses, resulting in illness. Understanding infection is crucial for developing treatments and preventive measures, such as vaccines and antibiotics.
