| A double-blind study of more than 7,000 women around the world found Pfizer's vaccine administered in the third trimester of pregnancy to be effective in preventing severe illness from the virus, which is the leading cause of hospitalization in young children. It's unclear whether the maternal RSV vaccine, Abrysvo, would be available in time to protect infants born during the upcoming RSV season, which usually starts in fall and peaks in winter. | 
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