👉 Disease infection refers to the process by which a pathogen, such as bacteria, viruses, fungi, or parasites, enters and establishes itself within a host organism, leading to illness or disease. This can occur through various routes, including respiratory droplets, contaminated food or water, vectors like mosquitoes, or direct contact with infected individuals or surfaces. Once inside, the pathogen can replicate, evade the host's immune system, and cause damage to tissues and organs, resulting in symptoms that range from mild to severe. The body's response to the infection, involving inflammation and immune cell activation, can also contribute to the pathology of the disease. Understanding the mechanisms of infection is crucial for developing effective treatments and preventive measures.