Using 10-12 shellfish, obtain 200 g of shellfish liquor and meat. Blend 2 min, with 200 mL sterile phosphate buffered dilution water or 0.5% peptone water (R97) to yield a 1:2 dilution of sample. Analysis of the ground sample must begin within 2 min after blending. Make serial dilutions in 0.5% sterile peptone water or sterile phosphate buffered dilution water.