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By Jon Cohen / Science.org
Recently approved adult vaccines against respiratory syncytial virus (RSV) are already saving lives. But prospects have dimmed for some infant vaccines against the virus, which each year kills up to 100,000 children under age 5 around the world and is the leading cause of infant hospitalizations in the United States. In recent clinical trials, two experimental RSV vaccines for babies may not only have failed to protect them, but actually made some of them sicker when they got RSV or another respiratory virus.
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