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Volume 15, Number 5—May 2009

Dispatch

Human Streptococcus agalactiae Isolate in Nile Tilapia (Oreochromis niloticus)

Joyce J. EvansComments to Author , Phillip H. Klesius, David J. Pasnik, and John F. Bohnsack
Author affiliations: US Department of Agriculture, Chestertown, Maryland, USA (J.J. Evans, D.J. Pasnik); US Department of Agriculture, Auburn, Alabama, USA (P.H. Klesius); University of Utah Health Sciences Center, Salt Lake City, Utah, USA (J.F. Bohnsack)

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Table

Mortality rates among Nile tilapia (Oreochromis niloticus) infected with Streptococcus agalactiae*

Dose (CFU/fish) No. (%)† deaths
Tryptic soy broth (control) 0a
102 3 (30)ab
103 1 (10)a
104 0a
105 0a
106 5 (50)b
107 3 (30)ab

*Ten fish per dose group were intraperitoneally injected with human S. agalactiae/fish or tryptic soy broth and observed for 14 days postchallenge at a water temperature of 32°C.
†Superscript letters indicate significant differences (p<0.05) in percentage mortality rates between groups, determined by using the SAS program (SAS Institute, Cary, NC, USA) lifetest procedure (Kaplan-Meier method).

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