Description: Porn actor Mr. Marcus has come out and identified himself as the performer responsible for the current syphilis outbreak that has shut down production in the San Fernando Valley. He believes he contracted the STD on set but admits that he altered his syphilis-positive test so that he could keep performing. His altered test was what started the scare and initiated the industry's self-imposed 10-day moratorium while actors are tested and treated for syphilis. The porn actor was diagnosed with syphilis on July 12, received a penicillin shot on July 13 and returned to work 11 days later, on July 24, AVN reports. However, he still had the STD. Perhaps most disturbing, the producer of the shoot didn't ask for a paper or digital copy of Marcus' STD test. Instead, the actor showed a copy of the test on his cell phone so that the syphilis portion wasn't visible. For a subsequent porn shoot, Marcus said he folded his test covering the syphilis portion and photocopied it. However, a producer noticed this time that the numbers were missing and called Marcus out on it.