145 Bulgaria; An Ounce of Prevention
Travel with Rick Steves
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The Difference Between a Required Shot and a Recommended Shot
The Centers for Disease Control has a very good website and call-in number. The only one vaccine that's still required for entry to some countries is the yellow fever vaccine. With one exception, that being the meningitis vaccine for people going to the Hajj and Saudi Arabia; other than that, there are no requirements.
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