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Int J Syst Evol Microbiol 57 (2007), 1603-1606; DOI  10.1099/ijs.0.64810-0
© 2007 International Union of Microbiological Societies

Streptococcus ictaluri sp. nov., isolated from Channel Catfish Ictalurus punctatus broodstock

P. Lynn Shewmaker1, Alvin C. Camus2, Tim Bailiff1, Arnold G. Steigerwalt1, Roger E. Morey1 and Maria da Glória S. Carvalho1

1 Centers for Disease Control and Prevention, Atlanta, GA 30333, USA
2 National Warmwater Aquaculture Center, 127 Experiment Station Road, Stoneville, MS 38776, USA

Correspondence
P. Lynn Shewmaker
paw3{at}cdc.gov

A streptococcal-like organism was associated with diseased Channel Catfish Ictalurus punctatus broodstock on four commercial aquaculture operations in the Mississippi Delta. Conventional biochemical testing, 16S rRNA gene sequence analysis and DNA–DNA hybridization distinguished the isolates from these fish from previously published Streptococcus species. Comparative 16S rRNA gene sequencing studies revealed that the isolates were phylogenetically most similar to Streptococcus iniae, Streptococcus uberis and Streptococcus parauberis with divergence ranging from 2.0 to 2.3 %. Streptococcus pyogenes, Streptococcus urinalis, Streptococcus dysgalactiae subsp. dysgalactiae and Streptococcus canis were included in the analysis and showed even greater differences (2.5–3.2 % divergence). DNA relatedness was 22 % or less to the most phylogenetically related species at the optimal temperature. These data suggest that the isolates represent a novel species of Streptococcus for which the name Streptococcus ictaluri sp. nov. is proposed. The type strain is 707-05T (=SO2-1108T=ATCC BAA-1300T=CCUG 52536T).

Abbreviations: PYR, pyroglutamylaminopeptidase

The GenBank accession number for the 16S rRNA gene sequence of Streptococcus ictaluri 707-05T is DQ462421.

A minimum-evolution phylogenetic tree based on 16S rRNA gene sequences including Streptococcus ictaluri strains and the most closely related full-length type strains is available with the online version of this paper.






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Copyright © 2007 by the International Union of Microbiological Societies.