Antonie van Leeuwenhoek

, Volume 86, Issue 1, pp 65–76 | Cite as

Factors influencing the replication of somatic coliphages in the water environment

  • Maite Muniesa
  • Juan Jofre


The potential replication of somatic coliphages in the environment has been considered a drawback for their use as viral indicators, although the extent to which this affects their numbers in environmental samples has not been assessed. In this study, the replication of somatic coliphages in various conditions was assayed using suspensions containing naturally occurring somatic coliphages and Escherichia coli WG5, which is a host strain recommended for detecting somatic coliphages. The effects on phage replication of exposing strain WG5 and phages to a range of physiological conditions and the effects of the presence of suspended particles or other bacteria were also assayed. Phage replication was further tested using a strain of Klebsiella terrigena and naturally occurring E. coli cells as hosts. Our results indicate that threshold densities of both host bacterium and phages should occur simultaneously to ensure appreciable phage replication. Host cells originating from a culture in the exponential growth phase and incubation at 37 °C were the best conditions for phage replication in E. coli WG5. In these conditions the threshold densities required to ensure phage replication were about 104 host cells/ml and 103 phages/ml, or 103 host cells/ml and 104 phages/ml, or intermediate values of both. The threshold densities needed for phage replication were higher when the cells proceeded from a culture in the stationary growth phase or when suspended particles or other bacteria were present. Furthermore E. coli WG5 was more efficient in supporting phage replication than either K. terrigenae or E. coli cells naturally occurring in sewage. Our results indicate that the phage and bacterium densities and the bacterial physiological conditions needed for phage replication are rarely expected to be found in the natural water environments.

Coliphages Environment Replication 


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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Maite Muniesa
    • 1
  • Juan Jofre
    • 1
  1. 1.Department of Microbiology, Faculty of BiologyUniversity of BarcelonaBarcelonaSpain

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