Trump signed an executive order on Tuesday intended to ensure that priority access for COVID-19 vaccines procured by the US government is given to the American people before assisting other nations.
Biden won the White House in large part because of support from the nation's Black community, and the president-elect has made addressing civil rights one of the main pillars of his administration, promising to expand support for Black-owned businesses and reform the justice system.
The vaccine news helped offset fears from a sharp rise in coronavirus cases globally that has led to a string of renewed lockdowns, including strict measures in California, Germany and South Korea.
The Trump administration proposed a $916-billion pandemic relief package on Tuesday, while the United Kingdom became the first country to begin mass-vaccinating its people using a fully-tested COVID-19 shot.
Janssen has begun its coronavirus clinical trials in Mexico, and Lopez-Gatell said the memorandum his government signed on Monday gave it the option of ordering additional doses.
In the statement, Health Minister Eduardo Pazuello said Brazil's public health system, known by its local acronym 'SUS', has the capacity to administer 300 million vaccine doses next year.