三、轮状病毒疫苗轮状病毒（rotavirus，RV）是世界范围内引起婴幼儿腹泻的主要病原体。
O O B-dru I-dru I-dru I-dru I-dru I-dru B-mic I-mic I-mic I-mic O B-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic O B-mic I-mic O O O O O O O O O O O O B-dis I-dis O O O O O O O