Every few years, a strain of bird flu becomes deadly to us. This year, the strain is H7N9 and it's already taking lives in China. Forgive my skepticism, but China may report only 13 deaths, but the true death toll could be higher. I suspect that it's higher.
So, what do we know about this bird flu?
I'd recommend the influenza A H7N9 resource page on the New England Journal of Medicine:
Of course, the CDC is also maintaining a page on Avian Flu.
This year, I suspect that social media monitoring/analytics may provide some valuable insights if this flu strain spreads globally.