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General travel-health advisories tell you what vaccines are recommended for your own protection. This is about something stricter: the legal International Certificate of Vaccination or Prophylaxis that some countries require a border official to see before they'll let you in. Some countries require it from every arriving traveler, others only if you're arriving from (or have recently transited) a country with risk of yellow fever transmission. Show up without it where required, and you can be denied boarding by the airline or quarantined on arrival.
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