👉 Infection is a biological process where pathogens, such as bacteria, viruses, fungi, or parasites, invade and multiply within a host's body, causing 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 immune system initially responds with inflammation and other defenses to contain and eliminate the pathogens. However, if the infection persists or the host's defenses are overwhelmed, it can lead to illness, ranging from mild symptoms to severe conditions that may require medical intervention. Understanding infection is crucial for developing preventive measures, treatments, and vaccines to protect against a wide array of diseases.
