“…In South Korea, data from 1980 to 1999 showed that rotavirus accounted for 46% of 4,668 Korean children admitted to hospital with gastroenteritis [Seo and Sim, 2000]. However, data since 2003 has shown lower rotavirus‐positive rates of 19% (1,367/7,060) for 2003–2005 from Gyeonggi province hospitals [Huh et al, 2009], 18% (571/3,174) for 2004–2005 from Seoul metropolitan hospitals [Lee et al, 2008], and 22% (1,337/6,057) for 2005–2007 from eight major hospitals in Nationwide [Lee et al, 2009]. It is probably the improvement of income levels, and thought might be related to improved sanitation.…”