👉 Infection is a complex biological process where pathogens, such as bacteria, viruses, fungi, or parasites, invade and multiply within a host organism, leading to disease. The interaction between these pathogens and the host's immune system is central to understanding infection. When a pathogen enters the body, it can evade or manipulate the immune response, causing damage to tissues and organs. This invasion triggers an immune reaction, which involves the activation of white blood cells and the production of antibodies to neutralize the pathogen. However, if the infection persists or overwhelms the immune system, it can result in symptoms ranging from mild discomfort to severe illness or even death. The severity and outcome of an infection depend on various factors, including the type of pathogen, the host's immune status, and the effectiveness of the body's defense mechanisms.
