A research team from Rollins College in Florida and the University of Georgia has identified human sewage as the source of the coral-killing pathogen that causes white pox disease of Caribbean elkhorn coral. Once the most common coral in the Caribbean, elkhorn coral was listed for protection under the United States Endangered Species Act in 2006, largely due to white pox disease.
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"Human Pathogen Shown to Cause Disease in the Threatened Eklhorn Coral Acropora palmata." (http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0023468)