"Enterovirus 68 was first identified in a California lab in 1962, after four children came down with a severe respiratory illness. Between 1970 and 2005, only 26 cases of enterovirus 68 in the United States were reported to the CDC. Since 2000, the government agency has kept a closer watch and has seen 47 cases, Oberste said."
http://www.cnn.com/2014/02/24/health/mystery-illness-in-california/
That "since 2000" qualifier makes it unclear how many of those 47 cases are 2000-2005 and how many between 2005 and the Southern Invasion.
Note: From the embedded link, "the highest number of reports in a single year was 11 in 2003". That drops that 26 down to 15 in 36 years. How many multiples of that are we seeing this year? A thousand-fold? Two thousand? So far, with three months to go?
Very helpful information, thank you!