If you want something done right, do it yourself. Johnson & Johnson put that adage into practice at the weekend, as it took over a supplier’s factory that makes a key ingredient for its coronavirus vaccine.

The US drugmaker said it was “assuming full responsibility” for the Baltimore plant and would be adding specialists in “manufacturing, quality and technical operations”. J&J had good reason to elbow aside Emergent BioSolutions. Workers had spoiled 15-million doses of J&J’s vaccine by accidentally mixing its ingredients with those for the Oxford/AstraZeneca jab...

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