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Just as Elena was about to buy the fruit, she remembered the briefing from her travel group: isn't just about what you eat, but what you carry across borders. That innocent mango could be home to invasive pests like the Oriental fruit fly, which can devastate entire agricultural industries if brought back home.

A list of you can take through airport security? TRAVEL SAFETY

How to find known for high hygiene standards? Food and Drink Considerations When Traveling - CDC Just as Elena was about to buy the

: She planned to check "Yes" on Question 11 of her CBP Declaration Form . How to find known for high hygiene standards

The morning sun was just beginning to hit the stalls of the local market in Mexico City when Elena reached for a vibrant, perfectly ripe mango. She had been traveling for three weeks, and while her Instagram was full of stunning cathedral shots, her stomach had its own story to tell. The Hidden Passengers