Merck chief executive Ken Frazier has cast doubt on the 12 to 18-month timeframe to develop an effective coronavirus vaccine, describing the widely mooted schedule as “very aggressive”.
“It is not something I would put out there that I would want to hold Merck to,” the US pharmaceutical group’s chief told the Financial Times, adding that vaccines should be tested in “very large” clinical trials that take several months if not years to complete.
“You want to make sure that when you put a vaccine into millions if not billions of people, it is safe,” he said.
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