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. 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. The push to keep up spread-mitigation efforts has been complicated by some states opting to lift essentially all Covid restrictions that had been in place. A new study shows that Pfizer and Moderna vaccines are less effective against the South African variant of the virus.
Pfiser and other nations are less favourable for the United States to battle against.
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Pfiser and other nations are less favourable for the United States to battle against .
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