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Coronavirus

    • Moderna says updated COVID-19 vaccine is effective against newer variant BA.2.86

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    Moderna on Wednesday said clinical trial data showed its updated COVID-19 vaccine will likely be effective against the highly-mutated BA.2.86 subvariant of the coronavirus that has raised fears of a resurgence of infections.

    The company said its shot generated an 8.7-fold increase in neutralizing antibodies in humans against BA.2.86, which is being tracked by the World Health Organization () and the U.S. Centers for Disease Control and Prevention ().

    鈥淲e think this is news people will want to hear as they prepare to go out and get their fall boosters,鈥 Moderna head of infectious diseases Jacqueline Miller said in an interview, adding that the data should also help reassure regulators.

    Moderna shares were down more than 2% in early afternoon trading.

    TD Cowen analyst Tyler Van Buren said Wednesday's news was unlikely to raise the share price because people already assume the mRNA vaccines will continue to be effective against new COVID variants as they crop up.

    "This was not an anticipated catalyst that people were waiting for," he said, adding that Moderna continues to be a favorite target of Wall Street short sellers who bet that shares will fall.

    The CDC has previously indicated that BA.2.86 may be more capable of causing infection in people who previously had COVID or were vaccinated with previous shots. The Omicron offshoot carries more than 35 mutations in key portions of the virus compared with XBB.1.5, the dominant variant through most of 2023 and the target of the updated shots.

    Moderna said it had shared the new finding on its vaccine with regulators and submitted it for peer review publication. The retooled shot has yet to be approved by the U.S. Food and Drug Administration, but is expected to be available later this month or in early October.

    The Massachusetts-based drugmaker and rival COVID-19 vaccine manufacturers Novavax and Pfizer with German partner BioNTech have created versions of their shots aimed at the XBB.1.5 subvariant.

    Last month, Moderna and Pfizer each said their new vaccines appeared to be effective against another new subvariant of concern dubbed EG.5 in initial testing. European regulators have since backed the Pfizer/BioNTech shot, with Britain's Medicines and Healthcare products Regulatory Agency approving the vaccine on Tuesday, but have yet to make any announcements on Moderna鈥檚 updated vaccine.

    BA.2.86 has now been detected in Switzerland and South Africa as well as Israel, Denmark, the U.S. and Britain according to a WHO official.

    While it is important to monitor the variant, several experts told Reuters it is unlikely to cause a wave of severe disease and death because of immune defenses built up worldwide from mass vaccination and prior infection.

    Editing by Bill Berkrot

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    N.L.

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