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RIO DE JANEIRO, BRAZIL - Two months into the first quarantines in Brazil, politicians, health authorities, and researchers are mostly in the dark. The weeks of advantage Latin America had on Asia and Europe seem wasted. The tests to detect the coronavirus, which officials, scientists, and analysts said in mid-March were crucial for isolating patients and minimizing damage to health and the economy, never quite reached the required level.

The tests conducted by the most affected country - and the most populous in Latin America - are so few that the magnitude of the epidemic is unknown. There is an official balance . . .

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