A Canadian study in Pediatrics found that one pediatric dose of the AS03-adjuvanted vaccine against pandemic influenza A/H1N1 in children aged 6 months to 9 years old was effective for preventing influenza-related hospitalization starting 10 days after vaccination. Researchers reported an 85% overall vaccine effectiveness when administered 14 days or more before illness onset. The results were based on the vaccination status of hospitalized and nonhospitalized children with pH1N1 in 2009.

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