This one has everyone freaked because it seems to be killing young adults. Young adults do not usually die from flu or complications from flu. The one major exception to that was the Spanish Flu epidemic in 1918. That flu killed young adults disproportionately and had a high mortality rate overall.
Right now, since the data we are getting is primarily from Mexico, it is difficult to tell how good the data is. We may be seeing observational bias. It is also possible that this flu may be a killer in the third world, but survivable with prompt first world medical treatment. The US had no mortality from SARS because people received prompt effective treatment.
Mexico is a 3rd world country and their health system is scared of this crisis. They aren’t doing the proper things so far, especially if the reports cited by Rush were correct.