Novavax's Covid shots rely on protein technology used in other vaccines for decades, rather than the messenger RNA used in the Pfizer and Moderna vaccines.
The FDA has authorized a third dose of Novavax's Covid vaccine for adults ages 18 and older.
The authorization of Novavax's booster could significantly increase the role that its shot plays in U.S. vaccination efforts. Up until now, Novavax's vaccine was only authorized as a two-dose primary series, which limited its market because so many people were already immunized with Pfizer of Moderna.
Novavax said its booster doses triggered robust antibodies against omicron BA.1, BA.2 and the dominant BA.5 subvariantwho received the third shot 8 to 11 months after receiving their Novavax primary series. The most common side effects of Novavax's vaccine are pain at the injection site, fatigue, headache, muscle pain, nausea and vomiting, according to the Centers for Disease Control and Prevention.
U.S. health officials believe Pfizer and Moderna's updated boosters will provide stronger protection against infection and disease this winter than the first generation of vaccines because they target omicron BA.5, which is causing most infections right now.
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