2.2. Microbiological analysis
All samples were examined quantitatively for E. coli, whereas a
subset of 1902 and 352 of the samples were also examined quantitatively
for enterococci and qualitatively for Salmonella, respectively.
The sample material, consisting of flesh and intravalvular fluid
(mantle water), were pre-treated in accordance with ISO 6887-3
(ISO, 2003), and examined for E. coli by a three times five tube Most
Probable Number (MPN) method using Oxoid Minerals Modified
Glutamate Broth (MMGB) and the chromogenic medium Oxoid