Linkmeister points to a couple of articles about the flu, both of the 1918 and modern varieties. The first article, about how the deadly Spanish influenza pandemic took hold in humans, does not specifically mention if it used samples of the actual virus that was recovered in Alaska a few years back, but I would assume that is the case (you can read more about it in Gina Kolata's book on the subject). Stay healthy, y'all.