U.S. regulators are allowing the release of about 10 million doses of Johnson & Johnson's COVID-19 vaccine from a troubled Baltimore factory, but many more doses can't be used and must be thrown out.

The Food and Drug Administration announced Friday that it had determined that two batches could be released from the plant, which is owned by Emergent BioSolutions and has been shuttered for eight weeks. But it said several other batches are not suitable for use and additional batches are still under review.

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