South America was the epicenter of the Covid-19 pandemic early this year. Experts are trying to find out why new infections and deaths are falling so fast. https://ift.tt/2YuxheJ https://ift.tt/2WXoQrR World New York Times September 4, 2021 at 08:00PMCovid Ravaged South America. Then Came a Sharp Drop in Infections.

By Ernesto Londoño, Daniel Politi and Flávia Milhorance from NYT World https://ift.tt/2YuxheJ
https://ift.tt/2YuxheJ https://ift.tt/2WXoQrR New York Times