Four adult entertainment production companies have stopped filming as a result of a performer testing positive for HIV. The studios that put a stop to filming are among the largest in the adult industry and include Vivid Entertainment, Wicked Pictures, Digital Playground, and Hustler Video. The Adult Industry Medical Healthcare Foundation in Sherman Oaks reported on Oct. 12 that a performer had tested positive for HIV. The foundation was not releasing the gender of the performer. The positive test comes more than a year after a female adult performer tested positive at AIM and at a time when the state is looking at making changes to workplace safety regulations specifically for adult productions. A statement released by AIM said the nature of the exposure will be determined following additional testing and analysis of genetic components of the infection. “At this time, it is impossible to know if the patient acquired the HIV virus from private conduct or on-camera activity,” the statement said.