As new diseases & medical conditions emerge, new community groups appear in the public health arena as consumer advocates or lobby groups seeking to affect policy or to represent "communities" formed around these new diseases & conditions. The role of these groups in public health, their political status, & the extent to which they are actually representative are highly problematic, challenging traditional ideas about public health. Using discourse theory, symbolic interactionism, & ethological theory, one such case is examined, exploring the perspectives of various communities on hepatitis C & issues that this raises for public health. 33 References. Adapted from the source document.