By Gram Slattery and Augustin Geist RIO DE JANEIRO/BUENOS AIRES (Reuters) – Throughout much of 2020 and early 2021, South America was ground zero in the global fight against COVID-19. Oxygen ran low in Peru. Gravediggers worked through the night in Sao Paulo, Brazil. Bodies were stuffed into shipping containers in Guayaquil, Ecuador. Brazil, the largest country in Latin America, saw its COVID-19 death toll rise to the second-highest in the world, while Argentina and Peru reported some of the heaviest death per capita figures anywhere. But in recent months, despite patchy health services and lo…

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