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.
The paper overhauls established thinking on the greatest puzzle of the famous naturalist's life. Darwin first mooted the theory of evolution in the late 1830's, but it but it was not until 1859 that it was finally published in his landmark work, the Origin Of Species. This mysterious 20-year interval has become known as âDarwin's delayâ or âthe long waitâ.