（2）病毒：①轮状病毒（humanrotavirus），是引起婴幼儿腹泻的主要病原；②诺如病毒（Norovirus）；③肠道腺病毒（adenovirus）；④其他，如星状病毒（astrovirus）、杯状病毒（calicivirus）及冠状病毒（coronavirus）等。
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