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Council directives for the production and marketing of shellfish according to European Union standards based on fecal coliform or E. coli levels in the meats (Anon. 1991)
| Classification | Fecal coliform limit | E. coli limit |
|---|---|---|
| A—sell without processing | <300 MPN/100 g | <230 MPN/100 g |
| B—depurate or relay | <6,000 MPN/100 g | <4,600 MPN/100 g |
| C—prolonged relay | <60,000 MPN/100 g | NA |
| D—prohibited | >60,000 MPN/100 g | NA |
NA: not applicable
