Brazil health regulator chief says analysis of Sputnik vaccine stalled Reuters 2 days ago BRASÍLIA, May 11 (Reuters) - Brazilian health regulator Anvisa's head Antonio Barra Torres said that the analysis of Russia's Sputnik V COVID-19 vaccine is stalled pending arrival of documents requested from its local manufacturing partner Uniao Química. Torres is testifying on Tuesday before a Senate committee investigating the Brazilian federal government's handling of the COVID-19 pandemic, which has already killed more than 423,000 people and infected more than 15.2 million here. (Reporting by Maria Carolina Marcello Writing by Ana Mano; Editing by Christian Plumb)