AIDS groups are searching for patients willing to tell their stories on television after a survey showed that messages conveyed by sufferers were most effective. A survey of 650 people, who had seen the television advertisement showing the late AIDS-stricken disc jockey J. J. Chan speaking about the support he had received from his family, found half would now use condoms more often. Thirty per cent of respondents said the advert prompted them to reduce their number of sex partners and to have a blood test. The survey was conducted in January by the Chinese University's Centre for Clinical Trials and Epidemiological Research. Centre director Dr Joseph Lau Tak-fai said more than half of viewers believed advertisements featuring AIDS patients were most powerful, while 16 per cent preferred a television star. Cheung Che-kwok, a member of the Committee on Education and Publicity on AIDS which encouraged J. J. Chan to appear in the commercial, said he had recently tried to persuade two other patients to share their experiences publicly. 'I am trying my best. I indeed hope there will be another J. J., but they are still hesitant,' he said. The AIDS Committee is planning to launch more than 10 advertisements in July starring five radio hosts, including Pamela Pak Wan-kam. The Hospital Authority yesterday launched a TV health programme focusing on common diseases. They include cancer, cerebrovascular disease, ischaemic heart disease, end-stage renal failure, chronic lung disease and diabetes mellitus.