Further Investigations of Live Respiratory Syncytial Virus Vaccine Administered Parenterally

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Abstract
Further clinical tests were carried out of a live attenuated respiratory syncytial virus vaccine administered parenterally. Neutralization of respiratory syncytial virus by homologous human antibody was a complement-dependent event and addition of guinea pig complement greatly increased antibody titers and the sensitivity of the test. Ninety-seven percent of 116 initially seronegative children developed antibody following vaccination and there was no evidence for contagious spread of the infection. Clinical reactions, if any, were mild and inconsequential. A small portion of initially seropositive persons appeared to develop antibody by booster effect and a portion of initially seronegative and seropositive persons developed detectable nasal antibody. Long-term follow-up failed to reveal any increase in severe respiratory disease in initially seronegative persons who were vaccinated. A very substantial reservoir of seronegative persons was found in the 7-47 mo. age group (35%) revealing a target population that could most benefit from being given the vaccine.

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