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One repeated sticking point for the CDC's panelists during deliberations on Thursday: the still-open question over whether boosting with mixed vaccines might be permitted -- since for those who received the Moderna or Johnson & Johnson COVID-19 vaccine, there is no third dose protection currently available.

The FDA's vaccine chief, Dr. Peter Marks, addressed the CDC's panelists ahead of Thursday's vote and acknowledged their frustrations.

\"I think we understand at FDA the relative urgency here of trying to have a solution for anyone who has been vaccinated with any of the authorized or approved vaccines,\" Marks said. \"Unfortunately, we're not in a place right now which I can give you an exact timeline, but I can tell you that we will proceed with all due urgency to try to get there as rapidly as possible.\"

ABC News' Eric M. Strauss contributed to this report.

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