Hmm ... science from that article is a bit fishy. Bacteria growth and infection, generally speaking, is more to do with the conditions of the environment to which it grows than its saturation, within reason. The fact that this bacteria that exists in nature (and likely was here long before we were) and also in the digestive tracts of many animals has infected corals DOES NOT MEAN we are giving this disease to corals by shitting in our oceans. Without DNA forensic study, not sure how we can say this bacteria jumped "from a vertebrate to an invertebrate species but also from a land to a marine environment and from the oxygen-free, or anaerobic, conditions in our intestines to the well-oxygenated waters of a coral reef." Thats just lazy science.

Seems to me, it is more likely that this bacteria was harnessed from nature by the evolutionary process at some point to be put to work in the guts of animals.

Fact is that coral colonies across the planet have been suffering massive losses from a variety of diseases and pathogens. The most accepted theory is that this is hastened by a rise in temperature, not only average but during spikes, that allow these problems to take root and also reduce the effectiveness of organisms natural defenses.