 In early 2021, in the eye of the Covid storm, there was a mix-up in the manufacturing of the Covid-19 vaccine developed by Johnson Johnson JNJ , Financial and manufactured by the contractor Emergent BioSolutions Inc. EBS , Financial. At Emergents Bayview site in Maryland, where the AstraZeneca AZN , Financial Covid vaccine was also manufactured, workers had accidentally mixed up ingredients of the two vaccines. 