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The first link in the chain of infection is the pathogen. A pathogen is anything that causes a disease. Bacterium A group of microscopic organisms that are capable of reproducing on their own, causing human disease by direct invasion of body tissues. Bacteria often produce toxins that poison the cells they have invaded.
Making the world better, one answer at a time. Pathogenic diseases Pathogenic diseases are caused by the presance of one or more pathogenic agent in the body, including viruses, bacteria, fungi, protazoa, multicellular parasites and aberrant proteins known as prions.