👉 An infection is an invasion of the body by pathogenic microorganisms, such as bacteria, viruses, fungi, or parasites, which can cause disease. When these microbes enter the body, they disrupt normal cellular functions and trigger an immune response to combat them. This process can lead to inflammation, tissue damage, and various symptoms characteristic of illness. Infections can be acquired through various routes, including ingestion, inhalation, skin contact, or vector-borne transmission (e.g., mosquitoes). They are a fundamental aspect of human health and medical practice, often requiring treatment with antibiotics, antivirals, antifungals, or other medications to eliminate the pathogens and restore normal bodily functions.
