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Two Maryland-based companies are racing to get a vaccine for respiratory syncytial virus (RSV) to market--and one just picked up a regulatory boost.

MedImmune, AstraZeneca's ($AZN) biologics research and development arm, announced on Thursday that the FDA is fast-tracking its RSV vaccine, MEDI8897. It joins Novavax ($NVAX), which received FDA fast-track designation for its candidate in November.