👉 Infection is a biological process where pathogens, such as bacteria, viruses, fungi, or parasites, invade and multiply within a host's body, causing disease. This invasion can occur through various routes, including respiratory droplets, contaminated food or water, or direct contact with infected individuals or surfaces. Once inside, these microorganisms disrupt normal cellular functions, leading to inflammation, tissue damage, and the symptoms associated with infection. The body's immune system responds by mounting an attack, but if the pathogen is too virulent or the host's defenses are weakened, the infection can progress, potentially leading to severe complications or systemic illness. Common signs of infection include fever, redness, swelling, pain, and fatigue, depending on the type and location of the infection.
