You are considered fully vaccinated:

2 weeks (14 days) after your dose of an accepted single-dose vaccine
2 weeks (14 days) after your second dose of an accepted 2-dose series
2 weeks (14 days) after you received the full series of an accepted COVID-19 vaccine (not placebo) in a clinical trial
2 weeks (14 days) after you received 2 doses of any “mix-and-match” combination of accepted COVID-19 vaccines administered at least 17 days apart*
If you don’t meet these requirements, you are NOT considered fully vaccinated. A booster dose is not needed to meet this requirement.