👉 Infection refers to the process by which a pathogen, such as a virus, bacterium, fungus, or parasite, enters and takes control of a host organism, leading to disease. This occurs when the pathogen breaches the body's natural barriers, like the skin or mucous membranes, and begins to multiply or cause harm. Infection can manifest in various forms, from mild symptoms like a cold to severe conditions such as sepsis or pneumonia. The body's immune system responds to the invader by initiating an inflammatory response and activating immune cells to fight off the pathogen. However, if the infection is severe or the immune system is compromised, it can lead to complications and chronic health issues. Understanding infection is crucial for developing effective treatments and preventive measures, such as vaccines and antibiotics, to protect against a wide range of infectious diseases.
