👉 Infection refers to the process by which a pathogen, such as a virus, bacterium, fungus, or parasite, enters and begins to multiply within a host organism, typically causing disease. This complex interaction involves the pathogen's ability to invade host cells, evade the immune system, and exploit cellular machinery for replication. Infection can occur through various routes, including respiratory droplets, contaminated food or water, sexual contact, or direct contact with infected bodily fluids. The body's immune response plays a crucial role in fighting off the infection, but if the pathogen overcomes these defenses, it can lead to symptoms ranging from mild discomfort to severe illness and even death. Understanding the mechanisms of infection is vital for developing effective treatments and preventive measures, such as vaccines and antibiotics, to combat infectious diseases.
