As of 5/12/23, the CDC updated the COVID-19 Vaccination Requirement guidance for civil.
The applicant must receive one dose of the COVID-19 vaccine if a dose is due at the time of the exam, according to current CDC guidance. Now, like other vaccine requirements, additional doses are no longer required, and applicants do not have to postpone the exam to complete the primary series of the COVID-19 vaccine.
Applicants who have completed any approved* primary COVID-19 series before the exam require no additional COVID-19 doses for immigration. Those who have not should receive a bivalent vaccine according to current CDC guidance.
For applicants who have received one or more doses but have not completed the primary series and are not yet due for the next dose in the series at the time of the exam, use the “Insufficient time interval between doses” blanket waiver.
As with other vaccinations, additional doses recommended for older age groups, health conditions, or immunocompromise are not required to complete this exam.
Source: Centers for Disease Control and Prevention (CDC)