On VDU's blog, Dr. Ian Mackay writes: H7N9 cases: trekking to the next peak. Click through for the full post and the chart he's discussing. Excerpt:
We can see from this chart that the next H7N9 wave is well underway.
There has been a distinct upward trend in new confirmed case announcements since about October 2013.
Despite what looks like a slow-down at the top of that peak (the pale blue mountain), remember that there is a lag between a patient getting sick and when that patient is announced to the public as a laboratory-confirmed H7N9 case. How long is that lag though?
As I did in 2013, I've plotted this lag as the time taken between date of confirmation (or date the case was reported publicly) against the week that case became ill. The data gaps represent times when there were no H7N9 confirmed/reported cases. The lag is currently sitting at approximately a week (6-8-days). So think of the slowing at the top of the peak in the earlier chart as more of a "guide" to what to may be coming rather than a true indication of now.