👉 Infection is a biological process where a pathogen, such as a virus, bacterium, fungus, or parasite, enters and establishes itself within a host organism, leading to disease. This entry can occur through various routes, including inhalation, ingestion, or direct contact. Once inside, the pathogen begins to multiply, often disrupting normal cellular functions and triggering an immune response. The host's immune system attempts to combat the infection, but if the pathogen is virulent or the host's defenses are compromised, the infection can progress, causing symptoms and potentially leading to severe illness or even death. Understanding infection is crucial for developing preventive measures, treatments, and vaccines to protect individuals and public health.
