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从人寻常疣组织中，在ＣｓＣｌ密度梯度为１．３４ｇ／ｃｍ３区内分离提纯得到的病毒颗粒，经负染后，在透射电镜下观察形态为圆球形，平均直径为５１．８±２．５３ｎｍ，表面布满子粒，排列呈五邻体和六邻体。从电镜所见，推断此病毒颗粒为二十面体，立体对称，子粒为４２个，Ｔ＝４，分离出的病毒属乳头瘤病毒（ＨＰＶ），这与Ｋｌｕｇ等１９６５年报道的ＨＰＶ不完全相似，后者颗粒表面具有７２个子粒，Ｔ＝７。
The virus particles isolated and purified from human verruca vulgaris under the CsCl density gradient of 1.34g / cm3 were observed under a transmission electron microscope after being negatively infected. The average diameter of the virus particles was 51.8 ± 2. 53nm, the surface covered with grains, arranged in pentagons and hexons. From electron microscopy, it was concluded that the virus particle was icosahedron, sterically symmetrical, with 42 particles, T = 4, and the isolated virus belongs to papilloma virus (HPV), which is not exactly similar to HPV reported by Klug and others in 1965 With 72 particles on the particle surface, T = 7.