According to the statement, 559 orders on various imports are currently in effect to "provide relief to American companies and industries impacted by unfair trade."
The central bank's action on Tuesday followed two similar interventions each on Thursday and Friday, the first time this year it had sold dollars in the spot FX market.
The Ottawa Group, which brings together the EU and 12 countries including Brazil, Canada and Switzerland, will meanwhile demand that countries commit not to hinder the flow of medical goods during the pandemic, and remove customs duties on those considered essential.
Still, showers on Argentina's Pampas grains belt in recent weeks have helped make up for the dryness that parched soybean and corn crops from the middle of last year, weather experts said on Monday.
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.