"Patient Zero," the Los Angeles porn star whose positive HIV test shut down four studios, apparently did not affect any of his or her partners. The first round of tests, at least, indicates as much.

"Everybody is continuing to test negative," an administrator with the Adult Industry Medical Healthcare Foundation, where the original infection first surfaced, told Adult Video News. The administrator said everyone has been tested at least once. Vivid Entertainment, Wicked Pictures, Hustler Video and Digital Playgrounds all swiftly shut down after the initial case was discovered. Wait: With routine testing, a willingness to put worker health ahead of profits and an embrace of transparent public disclosure, is the porn industry the most ethical collection of businesses in the country? (We're guessing that depends on what "filmmakers" you allow under the heading "porn industry" — and what workplace duties you're willing to consider "ethical.")