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.
Charles Darwin is renowned for his theory of evolution, but he was not the only person to develop a theory of evolution. Charles Darwin was an English naturalist. He studied variation in plants and animals during a five-year cruise around the world in the 19th century.