Big Number29,099,393. Brazil now leads the world in new cases. A new study shows that Pfizer and Moderna vaccines are less effective against the South African variant of the virus. What they're saying: "All this is good news," said Rochelle Walensky, director of the Centers for Disease Control and Prevention, during a briefing Wednesday. President Joe Biden last week blasted the decisions of the governors of Texas and Mississippi to lift restrictions as Neanderthal thinking.Key BackgroundThe drop in Covid cases over the past two months comes as vaccination efforts have ramped up.
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