Busy at work at the moment, so I apologise to my reader for the lack of posts, but this Bird flu crap prompts me to write.
Now I'm no medical expert, but surely the lethality of this thing is down to the fact that nobody has any antibodies that recognise it and attack it.
In order for it to be transmitted from human to human, it has to swap genes with an existing strain.
Won't the swapped genes then be spotted by the antibodies ? Hence making it...errr...a lot less lethal ?
If not, then if it's killing all its hosts, won't it stop spreading awful quickly anyway ?
Either way, I don't see why this is any different to any other virus myself...