[UPDATE: At least 16 previously unpublicized HIV cases in porn film performers, public health officials say]

Public health officials said today they have had no cooperation from the adult entertainment industry health clinic that recently confirmed a porn actress had tested positive for HIV, hampering their efforts to investigate how she contracted the virus.

The Adult Industry Medical Healthcare Foundation, a San Fernando Valley-based clinic, confirmed the positive test result to The Times on Wednesday. Despite requests from the county and state, AIM officials have not released the actress' name or provided the name of the production company or companies where she had worked.

“I don’t think we have the degree of cooperation that we would like in cases like this,” said Dr. Jonathan Fielding, Los Angeles County health officer. “We’d like a little more proactive cooperation.”

Fielding said it is routine for the county to conduct an investigation in cases of disease transmission at the workplace.