This could be a sample size of 1, but I just had my IHG Rewards Club card from Chase hacked and used multiple times (in person) in Brazil. I've never traveled to Brazil! Naturally, I called and cancelled the card. Interesting that this should happen so quickly, as I had recently received this card, and had only used it once! Proof (should it be needed) that you cannot check your credit card account(s) too often.