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Int J Syst Bacteriol 48 (1998), 921-927; DOI 10.1099/00207713-48-3-921
© 1998 Society for General Microbiology
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Streptococcus peroris sp. nov. and Streptococcus infantis sp. nov., new members of the Streptococcus mitis group, isolated from human clinical specimens

Yoshiaki Kawamura1, Xiao-Gang Hou1, Yuko Todome2, Ferdousi Sultana1, Kenji Hirose1, Sin-Ei Shu1, Takayuki Ezaki1 and Hisashi Ohkuni2

1Department of Microbiology, Gifu University School of Medicine, 40 Tsukasamachi, Gifu 500, Japan
2Department of Immunology and Infectious Diseases, Institute of Gerontology, Nippon Medical School, 1-396, Kosugi-cho, Nakahara-ku, Kawasaki, Kanagawa 211, Japan

Author for correspondence: Yoshiaki Kawamura. Tel: +81 58 267 2240. Fax: +81 58 267 0156. e-mail: kawamura{at}cc.gifu-u.ac.jp

ABSTRACT

Taxonomic studies were performed on eight strains of {alpha}-haemolytic streptococci that showed very low DNA-DNA hybridization similarity values with all established members of the mitis group of the genus Streptococcus. These strains were isolated from the tooth surface and pharynx of humans. 16S rRNA gene sequence analysis showed that these strains belonged to the mitis group, but that they fell into two new branches. DNA-DNA hybridization demonstrated two new similarity groups. From the results of the present study, the names Streptococcus peroris sp. nov. and Streptococcus infantis sp. nov. are proposed for these new groups. The type strains are 0–66T(= GTC 848T= JCM 10158T) and 0–122T(= GTC 849T= JCM 10157T), respectively.

Key Words: {alpha}-haemolytic streptococci • the mitis group • S. peroris • S. infantis • 16S rRNA • DNA-DNA hybridization

The DDBJ accession numbers for the 16S rRNA sequences of S. peroris, S. infantis and S. cristatus are AB008314, AB008315 and AB008313, respectively.




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