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UPDATE 3-Russian vaccine developer to sue Brazilian regulator for defamation Reuters 4/29/2021 (Adds Anvisa reaction) By Andrew Osborn and Lisandra Paraguassu MOSCOW/BRASILIA April 29 (Reuters) - The Russian developer of the Sputnik V coronavirus vaccine said on Thursday it would sue the Brazilian health regulator Anvisa for defamation, prompting a stern rebuttal from the agency. Anvisa's board on Monday denied requests by Brazilian states to approve Sputnik V for import. The agency's manager for medicines and biological products, Gustavo Mendes, said there was evidence an adenovirus used i...

UPDATE 1-Brazil in talks to buy 100 mln more Pfizer/BioNTech COVID-19 vaccine doses Reuters 6 days ago (Adds Anvisa decision) BRASILIA, April 20 (Reuters) - Brazil is in talks to buy another 100 million doses of Pfizer Inc's COVID-19 vaccine, Communications Minister Fabio Faria wrote on Twitter on Tuesday, as the country scrambles to procure more shots after a sluggish start to its vaccination program. "The negotiation started about 20 days ago and the (government) is seeking to speed up the process," he wrote. Brazil is one of the current epicenters of the coronavirus pandemic, driven by a...