Unknown respiratory disease in Cambodia

Having listened to Radiolab describe the origins and early history of HIV yesterday, I found this press release particularly fascinating. The World Health Organization is investigating an outbreak of an unknown disease in Cambodia. The disease begins with a fever, then progresses into neurological symptoms and very quickly to respiratory failure. All the recorded cases have been in children. 62 children were admitted to hospitals with these symptoms. 61 have died. (I should note that this doesn't necessarily mean that whatever this is has a 98% kill rate. We're only talking about the people whose symptoms were severe enough that they ended up in a hospital. There could be many more asymptomatic or mild cases.) (Via John Rennie)