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Moderna gave its mRNA-based seasonal flu vaccine to the first set of volunteers in a clinical trial, the pharmaceutical company announced today. The start of the trial marks the next stage of the company’s work on this type of vaccine technology after the overwhelming success of its COVID-19 vaccine, which was built using the same strategy. Before the COVID-19 pandemic, mRNA vaccines were still largely experimental, even as they were heralded as the future of vaccine development. People who get an mRNA vaccine are injected with tiny snippets of genetic material from the target virus. Their cells use that genetic information to build bits of the virus, which the body’s immune system learns to fight against. The high efficacy of the mRNA COVID-19 vaccines made by Moderna and Pfizer / BioNTec...