According to this article on ITIJ, by Clara Bullock "The Air V&V programme offers visitors…
BREAKING
New COVID-19 Vaccination Requirement for Green Card Applicants
According to this article on JDSUPRA, by J. Claire Razzolini, ,Gibney Anthony & Flaherty, LLP
“Effective October 1, 2021, by order of the Centers for Disease Control (CDC), USCIS and the U.S. Department of State will require individuals applying for permanent resident status to be vaccinated for COVID-19, with limited exceptions. Refugees are also covered by the order. Proof of full COVID-19 vaccination will be required along with the other vaccination requirements already in place in connection with green card applications.
Who is Impacted?
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A foreign national filing an Application to Adjust Status (I-485) and completing the required I-693, Medical Examination with a designated USCIS Civil Surgeon or after October 1, 2021 must be vaccinated.
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A foreign national applying for an immigrant visa at a U.S. consulate abroad and undergoing a physical examination with a designated Panel Physician on or after October 1, 2021 must be vaccinated.”