👉 Infection is a biological process where a pathogen, such as a virus, bacterium, or parasite, enters a host and begins to replicate, often causing disease. The dynamics of infection involve several key stages: initial contact, where the pathogen encounters host cells; invasion, where it penetrates or enters the host's body; replication, during which the pathogen multiplies within the host; and spread, where it moves from cell to cell or through bodily fluids to infect new areas. The host's immune system responds by mounting defenses, but pathogens can evade or suppress these responses, leading to varying outcomes from mild illness to severe disease. Factors such as the pathogen's virulence, the host's immune status, and environmental conditions influence the progression and severity of infection. Understanding these dynamics is crucial for developing effective treatments and preventive measures.
