Which of the following vaccines is the only mandatory travel vaccination that some countries require before you can enter their country?
Travellers who wish to enter certain countries or territories must be vaccinated against yellow fever ten days before crossing the border, and be able to present a vaccination record/certificate at the border checks.
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Here is a list of possible vaccines that you may need to get for the first time or boosters before you travel.
Do you need to be vaccinated to enter Europe? No. At the time of this writing, all European countries require no form of vaccination or COVID testing to gain entry.
Entry into Canada: Canadian law requires that all persons entering Canada carry proof of citizenship and identity. A valid U.S. passport, passport card, or NEXUS card satisfies these requirements for U.S. citizens. Children under 16 only need proof of U.S. citizenship.