Previous publications in Eurosurveillance already in September 2012, September and December 2013 raised questions and called for collaborative international public health efforts to mitigate and possibly contain the MERS-CoV outbreak [15-17]. Still, two years in the epidemic, many of the essential epidemiological parameters remain unknown, e.g. the source, the reservoir and the mode of transmission for primary cases. The role of camels in the emergence and transmission of the disease is further unexplained, even though the evidence for their implication is growing from veterinary and virology studies.