The first participant is reported to be in good health with no safety concerns after being injected on 19 June. A second booster dose will be administered within four weeks.
Brazil has become the second country in the world to confirm more than one million cases of Covid-19, as the disease continues to spread.
Brazil 2-0 Argentina: Gabriel Jesus and Roberto Firmino struck as the hosts advanced to the final at the expense of their bitter rivals
Move comes days before opposition leaders planned to bring in foreign aid
A fire has engulfed a dormitory at the youth team training centre of one of Brazil's biggest football clubs, killing 10 people, local media report.
Right-wing nationalist Jair Bolsonaro, who has vowed to crack down on political corruption, violent crime and ignite a moribund economy with deregulation and fiscal discipline, was sworn in as Brazil’s president on Tuesday.
Venezuela's President Nicolás Maduro has accused the US of plotting to kill him and topple his government.
Jair Bolsonaro, a former army captain, bested leftist Fernando Haddad in Sunday’s runoff, winning nearly 56 percent of the vote, according to official results with 92 percent of the ballots tallied.