👉 Infection occurs when a pathogen, such as a virus or bacterium, enters a host and begins to multiply, often leading to disease. The process typically starts with the pathogen's entry into the body through various routes like ingestion, inhalation, or skin contact. Once inside, the pathogen can invade host cells, evade the immune system, or directly damage tissues. This interaction triggers an immune response, but in some cases, the infection can persist or become chronic if the pathogen mutates or if the host's immune system is compromised. The severity of the infection depends on factors like the pathogen's virulence, the host's immune status, and environmental conditions. Understanding the dynamics of infection is crucial for developing effective treatments and preventive measures, such as vaccines and antibiotics.
