Minneapolis, US — Johnson & Johnson (J&J) halted the development of a new flu drug after a study suggested it wouldn’t work, a sign of how difficult it is to create treatments for viral infections as the world races to contain Covid-19.

The drug, pimodivir, was in the final stage of testing for patients with influenza A, the most common cause of the flu, when an interim look at the data showed it was unlikely to be better than standard care in helping hospitalised patients. The company stopped that trial and another in less-sick patients who weren’t hospitalised...

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