The effect of different treatments and methods of titration on the recovery of phages infecting Bacteroides fragilis as well as for both somatic and male specific coliphages in environmental samples were evaluated. Recovery of phages infecting B. fragilis is highly dependent on the treatment of the samples. The influence of the treatment in the recovery of coliphages was either null or low. Titration method had some influence on the recovery of phages, mainly those of B.fragilis, from sludge and sediment samples.

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