👉 Infection is a biological process where a pathogen, such as a bacterium, virus, fungus, or parasite, enters a host organism and begins to multiply, often causing disease. This occurs when the pathogen breaches the body's natural barriers, such as the skin or mucous membranes, and establishes itself within the host's tissues or fluids. The host's immune system then responds by mounting an attack to eliminate the invader, but if the pathogen is successful, it can lead to infection. Infections can range from mild, like a common cold, to severe, such as sepsis or pneumonia, depending on factors like the type of pathogen, the host's health, and the effectiveness of the immune response. Understanding infection is crucial for developing treatments and preventive measures, including antibiotics, vaccines, and hygiene practices.
