London — Inovio Pharmaceuticals has put a partial hold on a phase 2-3 study of its Covid-19 vaccine after US regulators raised questions about a delivery device used in the inoculation.

The US vaccine maker is working to answer questions from the US Food and Drug Administration (FDA) about the Cellectra 2000 device used in the trial, Plymouth Meeting, Pennsylvania-based Inovio said in a statement on Monday. The hold is not due to any adverse events from the vaccine, Inovio said...

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