The united states has required immigration visa applicants to show proof of immunization for years.
>Under the immigration laws of the United States, a foreign national who applies for an immigrant visa abroad, or who seeks to adjust status to a permanent resident while in the United States, is required to receive vaccinations to prevent the following diseases:
Mumps
Measles
Rubella
Polio
Tetanus and Diphtheria Toxoids
Pertussis
Haemophilus influenzae type B
Hepatitis B
Any other vaccine-preventable diseases recommended by the Advisory Committee for Immunization Practices
https://www.uscis.gov/tools/designated-civil-surgeons/vaccin...