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Moderna's sign is seen outside of their headquarters in Cambridge, MA on March 11, 2021.

Check out the companies making headlines in midday trading.

Moderna — Shares of the drug maker rose 7.8% after announcing it's developing a two-in-one vaccine booster shot that protects against both Covid-19 and the seasonal flu. The new vaccine, which the company is calling mRNA-1073, combines Moderna's current Covid vaccine with a flu shot that's also under development, according to a press release.

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