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病毒是一类十分特殊的生物。它非常小,只有用放大上百万倍的电子显微镜才能看得到。病毒的结构简单,整个身体仅由核酸和蛋白质外壳构成,蛋白质外壳决定病毒的形状。它们中有的呈杆状、冠状、线状,有的像小球、鸡蛋、炮弹,有的像蝌蚪。病毒体内的核酸决定病毒的类型。一种病毒中的核酸一变异,就成为一种新病毒,如流感病毒,它能够不断地发生变异,每一两年就会改变一下,而且每年都有一两个新病毒产生,病毒的变异性给人类预防和治疗疾病带来了巨大困难。
Viruses are a very special class of creatures. It is very small and can only be seen with an electron microscope that magnifies millions of times. The structure of the virus is simple, the entire body consists of only nucleic acid and protein shell, the protein shell determines the shape of the virus. Some of them are rod-shaped, coronal, linear, some like pellets, eggs, shells, and some like tadpoles. The nucleic acid in the virus determines the type of virus. Once a virus in a nucleic acid mutation, it becomes a new virus, such as influenza virus, which can continue to mutation, every two years will change, and each year there are one or two new virus, virus variability To human prevention and treatment of diseases has brought great difficulties.