Of all the crises facing the world, the one that has the most potential to kill lots of people is pandemic flu. This is no mere fearmongering in some larger cause (cf. global warming) but a lesson of tangible science (viruses mutate) and history (the Spanish flu of 1918 killed considerably more people than WWI).
So wassup with the much balleyhooed bird flu? We haven't heard much about it lately. The AP explains why. It's out there, but it's hard to track, and this isn't the season. But, and this is the significant point, it may not ever become the starting point of the next human pandemic. There's a certain randomness to all this that can't be predicted at all.
Such events as these are reminders that (a) much of what we fear never occurs; (b) much of what occurs we can't control. These are both good reasons to focus instead on that on which by definition one can actually depend.