August 20, 2022
https://www.cdc.gov/immigrantrefugeehealth/civil-surgeons/covid-19-technical-instructions.html
CDC:
“If an applicant refuses one or more doses of a COVID-19 vaccine series that is medically appropriate for the applicant, it should be documented that the vaccine requirements are not complete and that the applicant refuses vaccination. This applicant is Class A and is inadmissible to the United States.”