Performances of the award-winning "Anthrax Theatre" continue across the nation. Innovative variations on the original script are being demonstrated to test audiences, including stripping 200 Mervyn's shoppers naked, and forcing them to rinse themselves with laundry bleach. ----- POMONA, Calif. (AP) -- Hundreds of people were quarantined for hours inside a nightclub after a phony anthrax threat, at least the seventh such hoax in Southern California this month. No trace of the potentially deadly bacterium was found in preliminary tests, authorities said Sunday. A Los Angeles County hazardous materials team and the FBI's Domestic Terrorism Task Force were called to the Glass House club at 11:50 p.m. Saturday after a man called the Police Department and said ``a significant quantity'' of anthrax would be released into the air, police Lt. Gary Graham said. If inhaled and then left untreated, anthrax spores can cause respiratory failure and death within a week. About 800 people were kept inside the club for about four hours while the air-conditioning system was checked and samples taken for further study, Graham said. Clubgoers then were taken outside and given information on anthrax symptoms. They were then allowed to return to the club if they wished. Authorities had not immediately determined whether the threat was related to six others since the middle of the month. In each case, no evidence of anthrax was found: --On Dec. 14, a secretary at the Perris School District in Riverside County opened a letter that said, ``you've been exposed to anthrax.'' About 20 people were isolated and decontaminated. --On Dec. 17, an office building in the Westwood area of Los Angeles received a letter threatening exposure to anthrax. Nearly two dozen workers had to strip and go through a decontamination process. --On Dec. 18, a U.S. Bankruptcy Court in the Woodland Hills area was targeted and about 90 people underwent antibiotic treatment. --On Dec. 21, a telephoned threat emptied two Van Nuys courthouses and forced about 1,500 people into quarantine for several hours. --On Wednesday, the Chatsworth office of Time Warner Cable was evacuated after a threat. About 200 people had to leave their work stations. --On Thursday, Christmas Eve, a Mervyn's store in Palm Desert was the target of a hoax, and 200 people had to disrobe and were rinsed with a bleach solution. Anthrax hoaxes also have happened in Colorado, Kentucky, and Tennessee. -- Eric Michael Cordian 0+ O:.T:.O:. Mathematical Munitions Division "Do What Thou Wilt Shall Be The Whole Of The Law"