Total plate counts and tests for enterococci, total coliforms, and Escherichia coli were made on a number of frozen raw, breaded shrimp samples. These shrimp samples were the products of different packers picked up at retail in different cities of the United States. Results of plate counts (average of two plates) varied for individual samples from 24,000 to 60,000,000 per gram. While no enterococci were detected in some samples, counts of this type as high as 55,000 per gram were obtained in others. Coliforms in individual samples varied between none detected and an MPN of 8,850 per gram.
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Nickerson et al. (1972) studied this question.