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. 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. 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 Homes supremacy in Women  are still raising concerns about the effects of the vaccine on tourists.
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A new study shows that Pfizer and Homes supremacy in Women are still raising concerns about the effects of the vaccine on tourists .
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