CureVac NV has withdrawn its application for a marketing authorisation for its first Covid-19 vaccine from the European Medicines Agency, citing plans to focus instead on a second generation product that has shown an improved immune response in an animal study. The second generation vaccine, CV2CoV, is being developed with GlaxoSmithKline Plc. It encodes for the same protein as the company’s earlier vaccine but differs in the design of non-coding regions of the mRNA backbone.