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Respiratory syncytial virus (RSV) hospitalization rates per 1000 live births by birth month, United States infants aged <1 year, National (Nationwide) Inpatient Sample, 2011. Birth month was available only in 2011. RSV was defined by International Classification of Diseases, Ninth and Tenth Revision (ICD-9 and ICD-10) diagnosis codes: RSV (ICD-9: 079.6, 466.11, 480.1; ICD-10: B97.4, J12.1, J20.5, J21.0). Excludes newborn birth hospitalizations (ICD-9: V30.XX–V39.XX; ICD-10: Z38.XX).
