Hong Kong should help pay for Aids prevention work on the mainland, an academic has suggested. Chinese University Professor Joseph Lau Tak-fai, who is also chairman of the Coalition of Aids Service Organisations, said the spread of the disease on the mainland would in future affect the number of HIV cases in Hong Kong. He said it would make a significant difference if Hong Kong contributed $1 million to $3 million towards HIV prevention projects in Guangdong over several years. At an Aids academic conference in Guangzhou, Professor Lau said one study found that about 1.4 per cent of 900 prostitutes in Guangdong were HIV-positive. Preliminary findings of another study showed 10 per cent of intravenous drug users were infected, he said. However, Dr Homer Tso Wei-kwok, chairman of the Advisory Council on Aids, rejected the idea, saying the mainland was receiving help already. 'If anything they're having difficulty coping with the overwhelming amount of resources,' he said.