Exposure of certain viruses to low ionic strength results in subtle changes in the protein coat. 某些病置于低离子强度的环境中，可引起蛋白质外壳的细微改变。
Any of a group of small viruses that contain DNA in an icosahedral protein shell and cause disease in many vertebrates,especially mammals such as dogs and cattle. 小脱氧核糖核酸病毒一类在二十面体蛋白外壳中含有脱氧核糖核酸的小病毒中的任一种，在许多脊椎动物，尤其是狗和牛等哺乳动物中引起疾病。
