Dr. Ashish Jha, the White House Covid response coordinator, said the new omicron boosters mark a milestone in the fight against Covid.
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Fauci said clinical data from Pfizer and Moderna on shots that targeted the original version of omicron, BA.1, triggered a stronger immune response against omicron and other Covid variants compared to the original vaccines. BA.1 is the variant the caused last winter's massive surge. "It is reasonable to expect based on what we know about immunology and the science of this virus that these new vaccines will provide better protection against infection, better protection against transmission and ongoing and better protection against serious illness," Jha said.
The first generation Covid vaccines were more than 90% effective at preventing disease from Covid when they were first authorized in December 2020. But the protection provided by the old vaccines, which target the original Covid strain, has declined because the virus has evolved dramatically over the past two years into the highly immune evasive omicron variant.
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