COVID-19 Vaccines Under Development Not Guaranteed to Work, Warns Merck CEO

“If you’re going to use a vaccine on billions of people, you better know what that vaccine does,” he said.

Frazier’s comments came soon after a US official stated that drugmakers partnering with the US government were on track to begin actively manufacturing a COVID-19 vaccine by summer end. The Trump administration has rolled out Operation Warp Speed Program with a target to produce 300 million vaccine doses by the end of 2021. Merck plans to study potential vaccine and therapy candidates for COVID-19 but has not yet begun clinical trials for its vaccine.

Frazier warned that some previous vaccines “not only didn’t confer protection, but actually helped the virus invade the cell, because it was incomplete in terms of its immunogenic properties. So we have to be very careful.”

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