Fangoria reports writer/director John Lechago as saying:
“Since [Cannes], Contagion was offered as the alternative title for the international market, and every buyer seemed to prefer that one ... We are making a point to include ‘John Lechago’s’ in the title—not because of my raging ego, but because there are actually a few movies out there called Contagion, including one coming up from Steven Soderbergh."
Doesn't seem like a great idea to me -- and it's much more conventional and uninteresting as a title. Oh, well. The film itself still looks excellent.
Meanwhile, here's the latest trailer: