The countries are: Sudan, Lebanon, South Africa, Brazil, Nigeria, Tanzania, Ghana, Guinea, Sierra Leone, Ethiopia. The decision is effective from Thursday.
But Gebhart said users have limited options now because of the so-called "network effect" -- with so many people on WhatsApp, it's difficult to move away from the free service.
The Trump administration had sought to boost ties with Brazil, the largest economy in Latin America, and provide a counterweight to China, which has become Brazil's largest trading partner.
Spain has been hard-hit by the pandemic, recording nearly 60,000 deaths from over 2.8 million cases so far, including 350 of the strain detected in Britain.
The submission, the first of its kind in Brazil, was made by the federally funded Fiocruz Institute, which will manufacture the British vaccine locally.
Mexico City has been in a state of maximum alert since mid-December, with more than 90 percent of hospital beds full due to soaring infections. Non-essential activities have been suspended in the capital.
The federally-funded Fiocruz biomedical center in Rio de Janeiro is still awaiting its first shipment of ingredients for AstraZeneca's vaccine, pending Chinese export approval.
In a statement, the central bank said the publication of the Copom minutes will remain 8 a.m. on the Tuesday of the week following the policy decision and statement.
Anvisa, which has stipulated an efficacy rate of at least 50% for vaccines in the pandemic, has already pressed Butantan for more details of its study, after it filed for emergency use authorization on Friday.