I believe it is much worse than we're hearing. China is such a closed society that if they are sending out 50,000, and are admitting to that number, we could be in for a real shocker when the numbers start to come out.
Remember Chernobyl? The Soviets kept saying it wasn't bad...till the numbers had grown so large, they could no longer keep their secret.
50,000. That's one third of our peak combat deployment to Iraq.
For trying to put an infectious disease back into the lab, I think Beijing must be in a panic - BIG TIME.