My personal opinion is that the CDC is worthless, and I don't expect anything from them. The fact that 92 nationwide have died and the CDC is doing nothing but keeping a total speaks for itself.
I can't tell for sure without examining data that I don't have, but I've wondered if it might be mosquito born. While it's been very cold here for most of the winter, we do have occasional days when it warms up enough that the flies come out--so maybe the mosquitos do too. I'm also wondering if it might be flea-born.
The little 2yr.-old had an ear infection--not pneumonia. Her mother had given her some tylenol and she felt better but said she was tired and wanted a nap. She never woke up.
It might be something that remains latent and under control until the child develops something that stresses the immune system. When the immune system kicks in, it may trigger whatever this is to take off. Whatever it is, it may produce a toxin that attacks the respiratory center in the brain.
There's always the possibility that it's something genetic, too, since it only seems to be killing children.
How the medical community can shake their heads and mutter and not push for answers is simply beyond my understanding. They notify the CDC then figure they've done their duty. The CDC adds up the grand total and figures they've done their duty. I personally don't think much of either of them at the moment.
Here's a link that states they are:
Doctors' offices filled amid children's unexplained deaths
http://www.freerepublic.com/focus/news/849269/posts