A '''pathogen''' is an [[organism]] that causes [[disease]].<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc. 2000</ref> The most common pathogens are [[bacteria]](such as [[Escherichia coli|E Coli]]), [[viruses]](such as the influenza virus), [[fungi]](such as [[Ringworm]]) and [[protozoa]](such as [[Giardia lamblia|Giardia]]). 2000</ref>
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