My advice would be to keep planning, keep your guests informed and don't let panic set in.
There are several factors here that need to be realized before going into a full blown panic about the possbility of a global pandemic. First, the media doesn't always get it right and sometimes causes even more panic in an attempt to provide the facts. Second, its too early to tell what kind of flu virus this really is. Many health professionals are saying it could be very much like a seasonal flu but more analysis is needed before making that decision.
And finally, the mexican health care system is not like the ones in Canada, europe and the states. They don't have the ability to track and monitor all cases appropriately so the statistics just aren't there to say this perticular flu has a 10% death rate. It's actually probably closer to .001%.
Keep positive ladies!