There has been a rapid increase in the number of MERS cases in Saudi Arabia within the last few weeks. Although information from government officials has been lacking, there has been speculation by outside experts that the virus may have changed to become more efficiently transmitted. The attack rate among health care workers appears to have increased.
Dr. Ian Mackay has written an informative blog with a chart demonstrating what looks like a dramatic increase in the number of cases in Saudi Arabia.
You can find it here: