Big Number29,099,393. A new study shows that Pfizer and Moderna vaccines are less effective against the South African variant of the virus. More than 60 million Americans have now received at least one shot, according to the CDC, and the number of shots per day has now topped 2 million on average. 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 U.S. uses fewer vaccines than other countries.
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    :ARG0 (z1 / country
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                           :ARG4 (z6 / vaccine
                                     :ARG1-of (z7 / use-01
                                                  :ARG0 (z8 / country
                                                            :mod (z9 / other)))))))
the U.S. uses fewer vaccines than other countries .
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