A coronavirus. Source
Coronaviruses like these are the cause of many cold like illnesses and SARS (severe acute respiratory syndrome), but a new type of coronavirus seems to be infecting humans and has caused six deaths so far. This virus is being called novel coronavirus. It appears as if this strain, which is closely related to a bat-infecting version, originated in the Middle East. Currently only twelve people have been infected, but six of those people have died. Until more is known about this virus, I would recommend being careful while traveling to places like Saudi Arabia or Jordan.
To read more, check out this article.