色噜噜精品一区二区三区,国产乱码在线精品可播放,麻豆AV无码精品一区二区,久久亚洲精精品中文字幕,久久亚洲精品国产精品,久久久久久精品免费免费999,9999国产精品欧美久久久久久,国产精品va在线播放我和闺蜜,精品久久久无码人妻中文字幕,国产亚洲美女精品久久久,99精品视频免费热播在线观看

Kamitsuka PS, et al. Production and standardization of ECHO reference antisera. I. For 25 prototypic ECHO viruses. Am. J. Hyg. 74: 7-25, 1961. PubMed: 13751052

Hara M, et al. Lack of serological relationship of ECHO virus types 1 and 12. Proc. Soc. Exp. Biol. Med. 128: 683-687, 1968. PubMed: 4970077