Novavax Covid Vaccine Showed Myocarditis Safety Signal: FDA

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An FDA advisory committee briefing document says that Novavax’s Covid-19 vaccine’s two-dose primary series demonstrated significant efficacy, but it also showed similar risk signals seen with other Covid vaccines, such as myocarditis/pericarditis. The agency’s Vaccines and Related Biological Products Advisory Committee is being convened 6/7 to discuss and provide recommendations on whether the benefits of Novavax’s vaccine outweigh its risks for use in individuals 18 years of age and older.

 

According to the briefing document, vaccine efficacy against confirmed mild, moderate or severe Covid-19 was 90.4%. “All Covid-19 cases in the [Novavax] arm were mild; in the placebo arm, 11% of cases were moderate and 5% were severe. FDA notes that when data were collected in 2021 the predominant circulating Covid-19 strain was the B.1.1.7 (Alpha) variant.

 

On the safety side, FDA said: “Multiple events of myocarditis/pericarditis were reported in temporal relationship to NVX-CoV2373 administration, similar to myocarditis following mRNA Covid-19 vaccines and raising concern for a causal relationship to NVX-CoV2373. Events of lymphadenopathy were infrequent but reported by a higher proportion of participants in the NVX arm, with the highest rate observed after Dose 2 (0.2%). Review of the data also identified small imbalances in certain thromboembolic events, including cardiac and neurovascular events, hypersensitivity events, cholecystitis, uveitis, cardiac failure, and cardiomyopathy. However, a causal association between vaccination and these events cannot be concluded based on available data.”

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