👉 Exposure to infectious agents, such as bacteria, viruses, fungi, or parasites, can lead to infection when these pathogens enter the body and begin to multiply or cause damage. This process typically involves three stages: exposure, invasion, and colonization. Exposure occurs when an individual comes into contact with an infectious agent, often through vectors like mosquitoes, contaminated surfaces, or direct contact. Invasion happens when the pathogen breaches the body's natural barriers, such as the skin or mucous membranes, and begins to colonize specific tissues or organs. Colonization is the stage where the pathogen establishes itself, potentially causing symptoms ranging from mild irritation to severe illness, depending on the type of pathogen and the individual's immune response. Understanding this process is crucial for developing preventive measures and treatments to mitigate infections.
