Regulatory Review Didn’t Slow Covid Vaccines: Marks

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Keynoting the International Society for Pharmaceutical Engineering 2022 Biotechnology Conference, CBER director Peter Marks said regulatory pathways and review were not the biggest rate-limiting factor in Covid-19 vaccine development. Rather, he said, the real bottleneck was process development and manufacturing scaleup, as reported by Bioprocess Online.

Under Operation Warp Speed, Marks said, manufacturing development took place concurrent with condensed Phase 1, 2, and 3 trials. Thus, as soon as data indicated that a vaccine might have the potential to provide an immune response, manufacturing scale-up started and at the end of Phase 3 trials, millions of doses were ready to ship.

Marks said that while the doses would have been destroyed if not found to be safe and effective, that would have been a small price to pay for the ability to have something available.

Even in an expedited approach, Marks said, there were bottlenecks, including:

  • issues in securing sufficient raw materials;
  • a dearth of disposable supplies;
  • limited bioreactor capacity;
  • a shortage of well-trained professionals to operate the available bioreactor capacity; and
  • limited fill/finish capacity.

The lessons learned during Operation Warp Speed have accelerated the transition to continuous or semi-continuous production to enable agility, flexibility, reliability, and reproducibility in biologics manufacturing, Marks said.

“The advantage of moving in this direction is that we could potentially have our vaccine supply more easily ramped up on short notice,” he said.

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