👉 Infection, particularly in the context of infectious diseases, occurs when a pathogen—such as bacteria, viruses, fungi, or parasites—invades and takes control of a host's cells or tissues. This process begins when the pathogen enters the body through various routes like ingestion, inhalation, or contact. Once inside, the pathogen can multiply and spread, causing damage to host cells and tissues. The immune system typically responds by attempting to eliminate the invader, but if the infection is severe or the pathogen is highly virulent, it can lead to illness or disease. For example, a bacterial infection like strep throat involves bacteria entering the throat, multiplying, and triggering an immune response that can cause symptoms like sore throat and fever. Understanding the mechanisms of infection is crucial for developing treatments and preventive measures.
