Effectiveness of Rotarix™ Against Rotavirus Severe Gastroenteritis (RV SGE) in Infants in Panama

Inclusion Criteria for enrolled subjects and cases : * A male or female child born after 1 March 2006 (which corresponds to the date of introduction of Rotarix™ in the EPI) and at least 12 weeks of age. * Subject admitted to the study hospital for SGE (refer to the glossary) during the study period. * Onset of SGE \<= 14 days prior to admission. * Laboratory confirmed (i.e. by ELISA at the hospital laboratory) RV positive stool sample at hospital admission or during the first 48 hours of hospitalisation. Note: This criterion is applicable only for cases. * Written informed consent obtained from the parent or guardian of the subject. Inclusion criteria for controls: * Admitted for non-GE causes at the same hospital as the case. Note: This criterion is applicable to hospital controls only. * Living in the same neighbourhood as the case for at least three consecutive months. Note: This criterion is applicable to neighbourhood controls only. * At least 12 weeks of age and being born within ± 2 weeks from the date of birth of the case. If the list of children born within ± 2 weeks is exhausted, then the range would be extended to ± 4 weeks. * Written informed consent obtained from the parent or guardian of the child. Exclusion Criteria for enrolled subjects and cases: * Subject has previously participated as case or control in this study. * Hospitalisation is unrelated to GE. * Onset of SGE \> 48 hours after admission to the hospital (nosocomial infections). Exclusion criteria for controls: * For hospital controls: Child who has symptoms of GE during current hospitalisation or on the day of interview of his/her parent or guardian. OR * For neighbourhood controls: Child who has symptoms of GE on the day of interview of his/her parent or guardian. * Exclude children with the following vaccine preventable diseases: measles, mumps, rubella, diphtheria, pertussis, tetanus, tuberculosis, invasive Haemophilus Influenzae Type B (Hib) infections (meningitis, bacteraemia, septic arthritis, cellulitis, and epiglottitis) and hepatitis B. * Child has participated in the past as a case or control in this study. * Child living in the same house as the case. Note: This criterion is applicable to neighbourhood controls only