👉 Infections are a fundamental aspect of biological systems, characterized by the invasion and proliferation of pathogens—such as bacteria, viruses, fungi, or parasites—within a host organism. These pathogens breach the body's natural defenses, often entering through breaches in the skin, mucous membranes, or via vectors like insects. Once inside, they can multiply rapidly, leading to tissue damage, inflammation, and a range of clinical symptoms. The infection process involves the pathogen's ability to evade or manipulate the host's immune response, establish itself within tissues, and potentially spread to other parts of the body. Understanding the mechanisms of infection is crucial for developing effective treatments, vaccines, and preventive measures to combat diseases and protect public health.
