👉 Infection is a process where a pathogen, such as a bacterium, virus, fungus, or parasite, enters and takes control of a host organism, leading to disease. The invading agent initially breaches the host's defenses, often by exploiting vulnerabilities in the body's immune system or physical barriers like skin and mucous membranes. Once inside, the pathogen multiplies and can cause harm by disrupting normal cellular functions, triggering inflammation, or evading the immune response. This interaction between the invader and the host can result in symptoms ranging from mild discomfort to severe illness, depending on the pathogen's virulence and the host's overall health. Understanding the mechanisms of infection is crucial for developing effective treatments and preventive measures.
