Will current Covid-19 vaccines be less effective against Omicron?

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Current Covid-19 Vaccines Are Expected to Be Less Effective Against the Omicron Variant

Moderna's CEO, Stéphane Bancel, has indicated that current Covid-19 vaccines are likely to show reduced effectiveness against the Omicron variant compared to their performance against the Delta variant. While specific data is still pending, preliminary discussions with scientists suggest a "material drop" in efficacy is anticipated, though the precise extent remains to be determined.
Anticipated Reduction in Vaccine Efficacy

Stéphane Bancel, in an interview with the Financial Times, explicitly stated that he does not foresee a scenario where the effectiveness of existing vaccines against Omicron matches that seen with the Delta variant. He articulated that the scientific consensus he has encountered points towards a significant decrease in performance, though he stressed the need for empirical data to quantify this reduction.
Timeline for Data and Potential New Vaccines

Clarity regarding the precise efficacy of current vaccines against the Omicron variant is expected within approximately two weeks. Bancel also noted that if a new vaccine tailored to address the Omicron variant becomes necessary, it could take several months to begin distribution. Scientists are also working to understand the variant's severity and its potential to circumvent vaccine-induced immunity, a process that could take days to several weeks.
Continued Protection Against Severe Illness

Despite concerns about reduced efficacy against infection, experts believe that current vaccinations will likely continue to provide a crucial layer of protection against severe outcomes. John Wherry, director of the Penn Institute for Immunology, suggested that vaccination will probably still prevent individuals from requiring hospitalisation, even if breakthrough infections become more common.

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Will current Covid-19 vaccines be less effective against Omicron?

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