👉 An infection is an invasion of the body by pathogenic microorganisms, such as bacteria, viruses, fungi, or parasites, which can cause disease. When these microorganisms enter the body through various routes—like the respiratory tract, skin, or digestive system—they can multiply and disrupt normal cellular functions, leading to symptoms ranging from mild discomfort to severe illness. The body's immune system responds by mounting an attack to eliminate the invaders, but if the infection is severe or the host's defenses are weakened, it can result in complications. Understanding the nature of infections is crucial for developing effective treatments and preventive measures, such as antibiotics for bacterial infections, antivirals for viral ones, and hygiene practices to prevent their spread.
