Q: Is CDC concerned?
A: Yes, CDC is concerned about MERS-CoV. Most people who have been confirmed to have MERS-CoV infection developed severe acute respiratory illness. They had fever, cough, and shortness of breath. About half of these people died. Also, the virus spreads from person to person and has spread between countries. CDC recognizes the potential for the virus to spread further and cause more cases and clusters globally, including in the United States.
http://www.cdc.gov/coronavirus/mers/faq.html
Very frightening.
.
It crossed my mind as I was sitting on an airplane this week listening to people hack and cough.