If your ticket was booked to Mexico, perhaps now is the time to rebook.
Apparently a few airlines are waiving the cancellation and change fee's for flights to Mexico in light of the swine flu. Since I have to drop my mother in law off at LAX this coming weekend, I might swing by the AA ticket counter and cancel my 'flight' to GDL that's in December. Obviously still have to be certain they don't decide to refund the ticket as a 'courtesy' or something.