Travel gov't services
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Foreign Gov't Sources
U.S. Embassies, consular offices, and tourist bureaus are good for general info. They can be particularly helpful if you loose your passport, want to learn statistics about the country you plan to visit or get in trouble with the law.

The United States Department of State / Bureau of Consular Affairs posts travel advisory and warnings.
Customs 202-927-6724
Center for Disease Control & Prevention 877-394-8747