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Background  Extensive research effort has advanced our understanding of  Caenorhabditis  as a model system, but its natural association with bacteria remains to be explored in an ecological context. Explored associations vary vastly from mutualistic to parasitic.  Serratia marcescens  has been shown to be pathogenic to  Caenorhabditis  with a fitness cost .  The recent isolation of an entomopathogenic  Caenorhabditis briggsae  KT0001 /S. marcescens  SCBI association from the wild has allowed us to examine under laboratory conditions whether such an association poses a serious cost to  Caenorhabditis  as previously surmised for other  Serratia .    Results  A fecundity table of  Caenorhabditis briggsae  KT0001 fed on  S. marcescens  SCBI and the control fed on  E. coli  OP50 is presented. We found no significant difference in survivorship or total fecundity between the  S. marcescens  SCBI fed and  E. coli  OP50 fed  Caenorhabditis briggsae  KT0001. Only the mean onset of reproduction was significantly different between the two groups with  E. coli  fed  C. briggsae  maturing earlier (2.12 days) than those fed on  Serratia  (2.42 days) .Conclusion   S. marcescens SCBI  is not highly pathogenic to  C. briggsae  KT0001 indicating that the entomopathogenicity reported for this association may be beneficial for both the nematode and bacteria. In light of the fact that hitherto conducted experimental tests conform to widely held view that  Serratia  are highly pathogenic to  Caenorhabditis , the absence of a high fitness cost for  C. briggsae  we report here may indicate that this entomopathogenic association is non-transient suggesting nematode/bacterial associations in the wild may vary greatly. Consequently, broad generalizations about nematode/bacterial associations should be interpreted with care.

Effect of the bacterium Serratia marcescens SCBI on the longevity and reproduction of the nematode Caenorhabditis briggsae KT0001