BOGOTÁ, Colombia —

In the capital of Colombia, Bogotá, the mayor is warning residents to brace for “the worst two weeks of our lives.”

Uruguay, once lauded as a model for keeping the coronavirus under control, now has one of the highest death rates in the world, while the grim daily tallies of the dead have hit records in Argentina, Brazil, Colombia and Peru in recent days.

Even Venezuela, where the authoritarian government is notorious for hiding health statistics and any suggestion of disarray, says that coronavirus deaths are up 86 percent since January.

As vaccinations mount in some of the world’s wealthiest countries and people cautiously envision life after the pandemic, the crisis in Latin America — and in South America in particular — is taking an alarming turn for the worse, potentially threatening the progress made well beyond its borders.