a group of single-strand RNA viruses with a protein coat
例句
Honey bee sacbrood virus (SBV) is a kind of picornavirus, a small positive strand RNA virus, which is greatly threatened to the Chinese honeybee breeding. 摘要蜜蜂的囊状幼虫病是中华蜜蜂常见且危害严重的疾病，病原为一小正链RNA病毒。
Avian encephalomyelitis virus (AEV) is a picornavirus with a predilection for the central nervous system and other parenchymous organs of chickens that is transmited by the oral-faecal route. 禽脑脊髓炎病毒(Avian Encephalomyelitis Virus,AEV)是一种小RNA病毒。
