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Mathai Mammen, global head of research and development at J&J’s Janssen Pharmaceuticals, warned that limiting availability of the vaccine would hurt the world’s chances of achieving \"herd immunity.\"

In an emergency meeting last week, members of the advisory panel said they had too little data to make a recommendation either way, including whether younger women were more at risk. The advisers said they wanted to see if more cases emerged from the estimated 3 million people who received that vaccine in recent weeks before making a decision.

The disruption came at a critical time of the pandemic, with death and hospitalization rates tied to COVID-19 on the rise in nearly half the country. Health experts warned that variants of the virus were spreading more easily, impacting younger patients and that it's critical to vaccinate the broader population quickly before new variants might take hold.

At the same time, federal regulators wanted to alert doctors and hospitals to be on the lookout for complications and to know how to treat them. Heparin, a commonly used blood thinner, appeared to worsen conditions.

ABC News' Arielle Mitropoulos and Sony Salzman contributed to this report.

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