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Pfizer RSV vaccine that protects infants could receive FDA approval this summer

’s vaccine that protects infants from respiratory could receive Food and Drug Administration approval by the end of this summer.

Pfizer on Tuesday said the FDA is reviewing the vaccine on an expedited basis. The agency is expected to make a decision on whether to clear the shot in August, just before respiratory virus season.

The single-dose vaccine is administered to expectant mothers in the late second to third trimester of their pregnancy. The antibodies triggered by the shot are passed to the fetus, and protect infants against RSV from birth through the first six months of life, when they are most vulnerable.

The vaccine was 82% effective at preventing severe disease from RSV in newborns during the first 90 days of life, according to data from Pfizer’s clinical trial. The shot was about 70% effective during the first six months of the baby’s life.

No vaccine to protect against RSV exists now. Infants younger than 6 months are also too young to receive most shots recommended by the Centers for Disease Control and Prevention.

RSV is the leading cause of hospitalization for infants in the U.S., according to epidemiologists. Almost all children catch RSV by the time they are 2 years old, and in most cases the virus causes a mild, cold-like illness. But infants face a higher risk of severe disease.

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