Big Number29,099,393. 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. A new study shows that Pfizer and Moderna vaccines are less effective against the South African variant of the virus. Brazil now leads the world in new cases. However, there are concerns that Pfizer and Modernas vaccines, the first two of three approved for use in the U.S., will not be able to defend against new variants as well.
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odds were found in brazilian research
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