Novavax Surges on Vaccine Success Against Respiratory Disease

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Novavax Inc. surged the most in six years after its vaccine helped elderly patients in a mid-stage study fend off a potentially lethal respiratory virus.

The vaccine reduced the risk of the disease associated with lower respiratory infection by 46 percent when compared with a placebo in 1,600 patients aged 60 and older, according to a statement late Monday. The shares rose 24 percent to $13.89 at the close in New York on Tuesday, giving Novavax a market value of $3.75 billion.