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Pathogen is a MICROBE capable of causing illness. The most common pathogens are BACTERIA, fungi, parasites, and viruses. The process through which a pathogen, also called an infectious agent, causes illness is pathogenesis. The body attempts to protect itself from pathogens through numerous mechanisms, key among them being ANTIBODYMEDIATED IMMUNITY and CELL-MEDIATED IMMUNITY. Vaccines and treatments with ANTIBIOTIC MEDICATIONS, ANTIVIRAL MEDICATIONS, and ANTIFUNGAL MEDICATIONS are among the methods available to contain and eradicate pathogens once they establish infection in the body.