I was involved in getting the #oxfordvaccine @JennerInstitute manufacturing process and consortium up and running. Here is a thread of why there is an issue with doses, with some science and #sciencepolicy. The EU looks in the wrong to me. To make the vaccine, you need to grow up a huge volume of cells, they make the vaccine, then the vaccine is purified. The manufacturing process is new. It relies on elements used before, but each new process has its own parameters.