A top federal pandemic official warned last June that Emergent BioSolutions, the government contractor that last month threw out millions of doses of Covid-19 vaccines because of contamination, lacked enough trained staff and had a record of problems with quality control... The assessment, which has not been released publicly, was based in part on a visit to the plant just days after the government awarded Emergent a contract worth up to $628 million, mostly to prepare its factories to make coronavirus vaccines as part of Operation Warp Speed. Addressing the problems “will require significant effort,” and the company “will have to be monitored closely,” said the report, which was written by Carlo de Notaristefani, a manufacturing expert who has overseen production of Covid-19 vaccines for the federal government since last May. Though marked as a draft, federal officials said the report was considered to be final.