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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.
Pathogenic fungi are fungi that cause disease in humans or other organisms. The study of pathogenic fungi is referred to as  medical mycology .. Although fungi are eukaryotic organisms, many pathogenic fungi are also microorganisms. Fungicides, such as ziram are used to protect plants against fungal infections.ryptococcus neoformans is the major human and animal pathogen. Cryptococcus laurentii and Cryptococcus albidus have been known to occasionally cause moderate-to-severe disease in human patients with compromised immunity.