Novavax (NASDAQ:NVAX) announces positive results from the first portion of its Phase 1/2 clinical trial evaluating its COVID-19 vaccine candidate, NVX-CoV2373, with and without the Matrix-M adjuvant, in healthy adults between 18 and 59 years of age.

NVX-CoV2373 was well-tolerated with mild reactogenicity events, mostly injection site pain and tenderness, while systemic events, less frequent, included headache, fatigue and myalgia (muscle pain) after dose 1 (5 µg). Reactogenicity was greater after dose 2 (25 µg) as expected since it was a higher dose. The average duration of events was less than two days.

On the immunogenicity front, the vaccine induced 100% neutralization titers in all participants. All subjects developed anti-spike IgG antibodies after one dose while many also developed wild-type virus neutralizing antibody responses. After the second dose, all participants developed wild-type virus neutralizing antibody responses. The IgG responses were highly correlated with neutralization titers.

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