👉 Infection is a process by which a pathogen, such as a virus, bacterium, or parasite, enters and begins to multiply within a host organism, leading to disease. The movement of the pathogen can be categorized into several stages: initial entry, dissemination, and establishment. Initially, the pathogen gains access to the host through various routes like ingestion, inhalation, or contact. Once inside, it navigates the body's defenses, often evading immune responses by adhering to specific cells or tissues. The pathogen then spreads (disseminates) through the bloodstream, lymphatic system, or local tissues, multiplying rapidly. This spread can lead to systemic infection if the pathogen reaches vital organs, causing symptoms and potentially severe health issues. The movement of the pathogen is crucial for its survival and replication, ultimately determining the severity and progression of the disease.
