Evolution
This virus is a member of the enterovirus species A. This virus appears to have evolved only recently with the first known strain isolated in 1965. It was associated with an outbreak of neurological disease in the United States in 1969. It spread then to Europe with outbreaks there in Bulgaria (1975) and Hungary (1978). It has since spread to various countries in Asia where it has been responsible for several outbreaks, most recently in Cambodia (2012).
The strains fall into three taxa - named A, B and C. Both the B and C clades have been subdivided into B1-B5 and C1-C5. The C taxon appears to have evolved ~1970 while the A and B taxa evolved prior to this.
An analysis of strains isolated in Europe (Austria, France and Germany) showed that the clades C1b and C2b originated in 1994 (95% confidence interval 1992.7-1995.8) and 2002 (95% confidence interval 2001.6-2003.8) respectively.
Read more about this topic: Enterovirus 71
Famous quotes containing the word evolution:
“By contrast with history, evolution is an unconscious process. Another, and perhaps a better way of putting it would be to say that evolution is a natural process, history a human one.... Insofar as we treat man as a part of nature—for instance in a biological survey of evolution—we are precisely not treating him as a historical being. As a historically developing being, he is set over against nature, both as a knower and as a doer.”
—Owen Barfield (b. 1898)
“As a natural process, of the same character as the development of a tree from its seed, or of a fowl from its egg, evolution excludes creation and all other kinds of supernatural intervention.”
—Thomas Henry Huxley (1825–95)
“The evolution of a highly destined society must be moral; it must run in the grooves of the celestial wheels.”
—Ralph Waldo Emerson (1803–1882)