After less than a four-week shut-down brought on by the discovery that an actor had tested HIV-positive, porn industry cameras are rolling again.

Two of the biggest companies began shooting again last week and Vivid Entertainment announced it will resume on Monday. All the companies involved have their studios in LA’s San Fernando Valley and it is not uncommon for porn stars to work for multiple producers.

The shut down began October 12 after an actor, referred to as Patient Zeta, tested positive for HIV. The situation was called a “time bomb” by former porn superstar Jenna Jameson in an exclusive interview with RadarOnline.com.

“We can now confirm that all performers who were on the quarantine list as a result of being exposed to the HIV positive performer have gone through two rounds of testing and the results are negative,” said Vivid co-chairman Steven Hirsch.

“It was like a ticking time bomb before something like this happened,” Jenna exclusively told RadarOnline.com, who admitted to not knowing about the news yet.

But guidelines from the AIDS Healthcare Foundation indicate the porn studios should wait at least another month before putting exposed performers back on the job. “It could be anywhere from 12 weeks to six months that an HIV infection could appear,” explained communications director Ged Kenslea.