亚洲精品无码成人片久久不卡,亚洲自偷自偷在线传媒,亚洲精品在线,久久无码精品九号,欧洲av人人爽爽,亚洲精品蜜桃久久久久久,亚洲精品久久午夜无码专区电影,辽宁少妇高潮45分钟,少妇高清性色生活片,无码八少妇久久

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