Pfizer says vaccine to prevent RSV in newborns is effective

Pfizer’s maternal vaccine against the respiratory syncytial virus reduced the rate of severe illness in newborns by 81.8%, the company said Tuesday, meeting the goal of a pivotal study.

The company said that it plans to file the data on the vaccine with regulators by the end of the year and that it expects an eight-month review.

RSV is a common cause of illness and infection in young infants. By giving the vaccine during pregnancy, researchers hope antibodies generated by mothers would be transferred to infants. Currently, the pertussis vaccine and the influenza vaccine are given during pregnancy for this reason.

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