"some of the passengers had originally come from the Saudi Arabian city of Mecca, which was currently experiencing a flu outbreak, and that this was also being considered as a possible cause."
^ that's from the BBC article. Yikes. MERS (Middle Eastern respiratory virus) was a problem a while ago wasn't it, and that evolved in Saudi Arabia, where some of the passengers have come from. Lets hope it's 'just' a less serious flu, and not MERS.
(My user name suddenly feels appropriate..)