What happened Emergent BioSolutions (NYSE: EBS) was a dog of a stock Thursday, plummeting to close down by over 13%. This followed news that the company apparently erred in the production process of Johnson & Johnson's (NYSE: JNJ) recently authorized coronavirus vaccine. So what Johnson & Johnson claimed that one batch of the vaccine manufactured at Emergent's Baltimore facility did not meet its quality standards, and thus could not be used. It did not specify the number of affected doses. Image source: Getty Images. This matters because the coronavirus has lately been resurgent in some parts of the U.S., and millions of Americans remain unvaccinated. Johnson & Johnson's jab is one of only three authorized by the Food and Drug Administration to combat the coronavirus, and the only one administered in a single dose (the others, from Pfizer/BioNTech and Moderna, are two-dose vaccines). Emergent said in a statement that it isolated the offending batch and would dispose of it in the proper manner. "Importantly, the quality control systems worked as designed to detect and isolate this single batch," the company wrote. "Discarding a batch of bulk drug substance, while disappointing, does occasionally happen during vaccine manufacturing, which is a complex and multi-step biological process." Now what While that's true, it's not going to help Emergent's reputation as a contract manufacturer -- a big side business for the vaccine specialist -- to the healthcare industry. Johnson & Johnson is a high-profile, mission-critical job, so it'll be a challenge for Emergent to rebuild trust in its processes. 10 stocks we like better than Emergent BioSolutionsWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Emergent BioSolutions wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of February 24, 2021 Eric Volkman has no position in any of the stocks mentioned. The Motley Fool owns shares of and recommends Emergent BioSolutions. The Motley Fool recommends Johnson & Johnson and Moderna Inc. The Motley Fool has a disclosure policy.Source