If this is a flu, and it isn't menangitis...if the kids were healthy otherwise (not asthmatics, or chronically ill)... there is cause for concern.
The article quotes a Dr as saying "most" of the children seem to have had upper airway infections. Does anyone have more information?
I assume that all of the kids were ill in some way, some having infections and others having flu, maybe. If one of the children wasn't sick at all, wouldn't that be mentioned?