This study aims to analyse baseline data on IS in order to monitor the possibility of increased risk of IS in children aged \<12 months after introduction of the Rotarix vaccination in Japan.
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Occurrence of IS in subjects aged < 12 months
Timeframe: Between January 2005 and April 2011 (6 years)
Occurrence of age-specific and gender-specific incidence of IS among subjects aged < 12 months in Japan
Timeframe: Between January 2005 and April 2011 (6 years)