精品999日本久久久影院,中文字幕无码免费久久,东北少妇不带套对白,亚洲国产AV无码专区亚洲AVL,精品国产18久久久久久,无码无套少妇毛多69XXX,无码人妻免费一区二区三区,亚洲中文字幕无码中文字幕

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