TABLE 2.

Efficiency of extraction methods as evaluated by RT-PCR detection of enteric viruses in concentrates prepared from mussel extracts

Extraction method	No. of positive samples/total no. of samples
	Astrovirus		HAV		Poliovirus		Total
	Undiluted samples	10-Fold-diluted samples	Undiluted samples	10-Fold-diluted samples	Undiluted samples	10-Fold-diluted samples	Undiluted samples	10-Fold-diluted samples
Borate	9/12	4/12	10/12	8/12	12/12	3/12	31/36	15/36
Glycine	7/12	4/12	12/12	9/12	11/11	3/12	30/35	16/36
Saline beef	0/18	0/18	3/18	2/18	13/18	6/18	16/54	8/54
Saline beef-Freon	11/18	0/15	10/18	0/18	11/18	4/18	32/54	4/51