👉 Infection is a biological process where a pathogen, such as a virus, bacterium, or parasite, invades a host organism, disrupting normal cellular functions and leading to disease. This invasion can occur through various routes, including respiratory droplets, contaminated food or water, or direct contact. Once inside the host, the pathogen multiplies and interacts with host cells, often triggering an immune response. However, if the pathogen is highly virulent or the host's defenses are compromised, it can cause infection, resulting in symptoms ranging from mild irritation to severe illness or even death. The body's immune system plays a crucial role in combating infections, but sometimes, the infection can overwhelm these defenses, leading to complications. Understanding the mechanisms of infection is vital for developing effective treatments and preventive measures.
