The CDC continues to suggest precautions that travelers and U.S. citizens resident in Mexico (especially those at high risk for complications of influenza) should take to reduce their risk of infection while in Mexico; provides recommendations for those who must travel to an area where cases of 2009-H1N1 influenza have been reported; and recommends measures travelers should take following their return from an area that has reported cases of 2009-H1N1 influenza. For complete CDC guidelines regarding H1N1 influenza, click here.