(NBC News) A failed clinical trial in the late ’60s pushed the development of an RSV vaccine back decades Cases of RSV continue to surge in the U.S., but a vaccine to protect young children against the respiratory virus remains a long ways off. RSV, or respiratory syncytial virus, is the most common cause of bronchiolitis and pneumonia in children under 1, causing thousands of pediatric hospitalizations and hundreds of deaths each year, according to the Centers for Disease Control and Prevention. That there is no RSV vaccine for kids is not for lack of interest, experts say. But a trial gone wrong many years ago and a tricky target protein have made developing an RSV vaccine difficult. Researchers’ attempts to develop an RSV vaccine go back decades, according to Dr. Ofer Levy, the director of the Precision Vaccines Program at Boston Children’s Hospital.
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