The hospitalization rate for babies younger than 24 months who were infected with respiratory syncytial virus was 5.2 for every 1,000 patients, according to a study in the journal Pediatrics. Researchers looked at records of 2,149 children hospitalized for acute respiratory infections between 2000 and 2005, and found that babies in their first month of life -- when the rate was 25.9 hospitalizations per 1,000 children -- had the highest risk of RSV-related hospitalization.

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