C. difficile diarrhea is largely a nosocomial disease and is the most frequent cause of diarrhea in hospitalized patients. Its occurrence in the outpatient setting, other than in patients confined to nursing homes, is much less common.
Darwin had arrived at a complete theory of evolution by 1839, but it was to be another 20 years before he published his ideas of evolution through natural selection in his epochal book On the Origin of Species by Means of Natural Selection.
Darwin's Theory of Evolution: Did Man Really Evolve from Apes? Charles Darwins theories on evolution upended the scientific community in the middle of the 19th century. He proposed that small changes over billions of years created the species we have today. Darwin felt that it was a survival of the fittest.