What is a pathogen?
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The definition of a pathogenic organism is an organism capable of causing disease in its host. A human pathogen is capable of causing illness in humans. Common examples of pathogenic organisms include specific strains of bacteria like Salmonella, Listeria and E. coli, and viruses such as Cryptosporidium.
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A pathogen is usually defined as a microorganism that causes, or can cause, disease.
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