Enteroviruses commonly circulate in the U.S. during summer and fall. EV-D68 was first identified in California in 1962. Over the past thirty years, only small numbers were reported in the U.S.
The CDC hasn’t suggested reasons for the current uptick or its origin. Without that answer, some question whether the disease is being spread by the presence of tens of thousands of illegal immigrant children from Central America admitted to the U.S. in the past year.
The origin could be entirely unrelated.
However, a study published in Virology Journal, found EV-D68 among some of the 3,375 young, ill people tested in eight Latin American countries, including the Central American nations of El Salvador and Nicaragua, in 2013. (See Fig. 3)
Though the U.S. government is keeping secret the locations of the illegal immigrant children, there are significant numbers of them in both cities in which the current outbreak was first identified, Kansas City, Missouri and Chicago, Illinois, according to local advocates and press reports.
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