1流行病学3～5岁儿童几乎都会感染轮状病毒,轮状病毒是导致全球年龄<5岁儿童发生脱水性腹泻的主要严重原因。低收入国家轮状病毒感染者主要是6～9月龄婴儿(80%是年龄<1岁的婴儿),高收入国家感染者年龄可推迟到2～5岁儿童,但多数仍然发生在婴儿期(65%是年龄<1岁的婴儿)。 1 Epidemiology Rotavirus is almost always infected in children aged 3 to 5 years. Rotavirus is the major cause of dehydration diarrhea in children younger than 5 years of age worldwide. Rotavirus infections in low-income countries are predominantly infants aged 6 to 9 months (80% of infants <1 year old) and those in high-income countries are postponed to children aged 2 to 5 years, but most still occur during infancy (65% were infants <1 year old).