👉 Infection, particularly from pathogens like bacteria, viruses, fungi, or parasites, occurs when these microorganisms invade and multiply within a host's body, disrupting normal physiological functions. This process begins when pathogens breach the body's defenses, such as the skin or mucous membranes, and enter the bloodstream or tissues. Once inside, they can colonize specific sites, leading to symptoms ranging from mild irritation to severe illness. The immune system responds by initiating an inflammatory reaction to contain and eliminate the invaders, but if the infection is not properly managed, it can cause tissue damage, systemic complications, and even death. Understanding infection and its mechanisms is crucial for developing effective treatments and preventive measures, such as antibiotics, vaccines, and hygiene practices.
