November 2021, 72-hour quarantine requirements were reinstated over concerns about the SARS-CoV-2 Omicron variant. Visa restrictions Henley & Partners World Tourism Organization The World Tourism Organization (UNWTO) of the United Nations has issued various Visa Openness Reports. Non-visa restrictions See also Visa fraud Electronic Travel Authority (Australia) Electronic System for Travel Authorization (US) Entry certificate List of nationalities forbidden at border Non-visa travel restrictions Travel document Van Der Elst visa Commonwealth Register of Institutions and Courses for Overseas Students (Australia) References Further reading United States Department of State, "Report of the Visa Office", Visa Office, Immigrant Visa Control and Reporting Division United States Department of State, Nonimmigrant Visa Statistics External links Human migration