Diarrhea-related hospitalizations per 10,000 children among commercially insured US infants, 8–20 months of age, in the pre–rotavirus vaccine period (2001–2005) and rotavirus vaccine period (2007–2010). Solid black line, rotavirus (International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM), code 008.61); small black dashed line, viral excluding rotavirus (ICD-9-CM codes 008.6 and 008.8, excluding 008.61); large black dashed line, bacterial (ICD-9-CM codes 001–005 and 008.0–008.5, excluding 003.2); hollow dashed line, presumed infectious (ICD-9-CM codes 009.0–009.3); dotted line, presumed noninfectious (ICD-9-CM code 558.9); dashed and dotted line, diarrhea otherwise specified (ICD-9-CM code, 787.91).