The president-elect received the Pfizer-BioNTech vaccine at ChristianaCare Hospital in Newark, Del., in an event that was carried on live television. Tabe Masa, a nurse practitioner and head of the hospital's employee health services, administered the vaccine.
Biden's wife, Jill Biden, received her first dose of the vaccine earlier Monday, according to the transition team.
Biden, who at 78 will be the oldest president ever inaugurated, is in a high-risk category because of his age. Harris and her husband, Doug Emhoff, will start their course of vaccinations after Christmas.
Pence and the top leaders in Congress received their first doses of the vaccine last week.
The White House has not given any indication as to whether Trump, who contracted covid-19 in October, will receive the vaccine. The president has touted the vaccine's development but has been notably absent from events aiming to reassure the public of its safety.