COVID-19 trial vaccine volunteer Luiz Augusto Menegazzo, 65, a doctor, a volunteer in COVID-19 vaccine trial for Sinovac, poses for a photograph in Sao Paulo, Brazil, December 04, 2020. Menegazzo who is married and has two sons, said: "I think we will remember this moment as a great moment of learning. A chance for humanity to learn, to be more humane, to live better, and for the government to take a closer look at its people." Picture taken with a slow shutter speed. REUTERS/Amanda Perobelli
SAO PAULO (Reuters) - From doctors weary of seeing patients die to relatives who lost their loved ones, thousands of Brazilians have volunteered for COVID vaccine trials in one of the world's worst-affected countries in the hope their quiet heroism will save lives.
Latin America's largest country has become a major testing ground for vaccines because of the scale of its outbreak, which has seen more than 7.3 million people infected and over 180,000 killed by the coronavirus.
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