Two concentration methods for recovering poliovirus from tap water are compared. Samples of tap water are artificially contaminated with poliovirus 1 Lsc 2ab and concentrated by adsorption-elution over either glass powder or glass wool. The results show that, for great viral contamination, the glass powder method provided a higher recovery yield than the glass wool method. But the glass wool method had the greater sensitivity. Viruses weredetectedin73.9% for viral contaminations of 4 to 50 PFU 20 l−1 when using the glass wool method although with the glass powder method viruses were detected in only 52.2 %.

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