Finally got around to this graph, one of my favourites from those I made for H7N9.
It shows the change in "Case Fatality Rate" (or PFC as I've taken to calling it here) over time. You will be able to see the graph more clearly on the MERS-CoVpage later today. It shows the very changeable PFC. Currently it is declining as death reports have slowed while the number of laboratory detections, including more that are mildly ill or with no signs and symptoms at all, continue to rise.