Brazil's death toll from COVID-19 surpassed 500,000 on Saturday as experts warn that the world's second-deadliest outbreak may worsen due to delayed vaccinations and the government's refusal to back social distancing measures. #News #Reuters Subscribe: http://smarturl.it/reuterssubscribe Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled. Get the latest news on: http://reuters.com/ Follow Reuters on Facebook: https://www.facebook.com/Reuters Follow Reuters on Twitter: https://twitter.com/Reuters Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en