U.S. regulators are allowing for the release of 10 million doses of Johnson & Johnson’s COVID-19 vaccine from a troubled Baltimore factory. But material to make many more must be thrown out because of possible contamination. That’s according to a person familiar with the decision. The FDA announced Friday that it had determined that two batches from the plant could be released. But it said several other batches are not suitable for use and additional batches are still under review. The doses originated at an Emergent BioSolutions factory, known as Bayview, that is making the vaccine for J&J.