Shellfishborne disease control in the United States: a commentary.

Shellfishborne disease control in the United States began in the 1920's. The water quality standard promulgated at that time to reduce the incidence of shellfishborne disease has never been adequately evaluated. Evidence suggesting such an evaluation is needed comes from 1) the frequency of shellfishborne disease outbreaks, 2) the changing nature of disease agents, 3) reports of shellfishborne disease in non-outbreak settings, and 4) microbiological studies indicating a lack of correlation between the standard and potential pathogenic organisms. A proper evaluation will define the standard's ability to protect human health and allow for the harvesting of an important food resource.