Major Hong Kong political parties have called on the government to impose an immediate ban on the importing of frozen pork from Sichuan province . Ahead of today's special meeting of the Legco food safety and environmental hygiene panel, its chairman Fred Li Wah-ming, of the Democratic Party, said the authorities had not acted decisively enough to protect public health. 'It seems that because of political considerations the Hong Kong government is prepared to let the mainland take the lead,' he said. 'This is contradictory to its swift response to news of a mad cow disease outbreak in Japan and other countries.' His deputy, Wong Yung-kan, of the Democratic Alliance for the Betterment and Progress of Hong Kong, said the sale of live pigs locally had already fallen 20 per cent. 'The government should quickly impose a ban on imports of frozen pork from Sichuan to show it means business,' he said. Meanwhile, Doctors' Union president Henry Yeung Chiu-fat said clinic doctors had been asked to watch out for patients with suspected symptoms of the pig-borne disease.