An influential foundation focused on preparation and response to epidemics that is backing nine potential coronavirus vaccines has identified manufacturers with capacity to produce four billion doses a year, the group's top manufacturing expert said.

The Coalition for Epidemic Preparedness Innovation (CEPI) plans to have two or three manufacturing plants for each vaccine, James Robinson, a longtime biopharma executive leading CEPI'S vast manufacturing push, said in an interview.

"Right now, we know we can do the 2 billion doses that we have as our kind of our minimum target" by the end of 2021, he said.