Mr. Bolsonaro, 66, also said: “She’s an adult, she’s 39, she knows what she’s doing and she got the vaccine.”
The president’s office sought to clarify the circumstances, explaining in a statement Friday night that all members of Mr. Bolsonaro’s entourage had to take a Covid test before boarding the plane back to Brazil. The statement said that during the test, the doctor administering it asked Mrs. Bolsonaro if she would like to be vaccinated.
“Since she had already been thinking about getting a shot, she decided to accept,” it said.
The statement did not identify the vaccine administered to her. Senator Omar Aziz, head of a parliamentary commission examining Mr. Bolsonaro’s handling of the pandemic, suggested she could have performed a patriotic duty by having been vaccinated at home.
“I congratulate Mrs. Michelle, who, unlike her husband, was vaccinated,” he told Brazilian media, but “someone should have told her that the vaccine applied in the United States is the same as in Brazil.” (In addition to the vaccines approved in the United States, Brazil has also used the Coronavac and AstraZeneca vaccines.)
Both Mr. and Mrs. Bolsonaro both tested negative on Sunday, his office said.
Nearly 600,000 Brazilians have died from Covid, the second-highest toll behind the United States, where more than 688,000 have died, according to a New York Times database, and only 41 percent of the Brazilian population has been fully vaccinated.
Ernesto Londoño contributed reporting.