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. Big Number29,099,393. A new study shows that Pfizer and Moderna vaccines are less effective against the South African variant of the virus. What To Watch ForHealth experts, like Walensky, are warning this is not the time for Americans to stop taking precautions, especially since several new, more contagious strains of Covid-19 are now spreading across the country. 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.
According to the CDC, two vaccines are approved for preventing typhoid fever.
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According to the CDC , two vaccines are approved for preventing typhoid fever .
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