Secretary for Health, Welfare and Food Yeoh Eng-kiong will attend a ministerial conference in Bangkok tomorrow to discuss ways of containing the bird flu pandemic. He will be accompanied by Deputy Director of Food and Environmental Hygiene Mak Sing-ping, Assistant Director of Agriculture, Fisheries and Conservation Liu Kwei-kin and Thomas Tsang, a Department of Health consultant. Mainland officials will also be at the conference. In Beijing yesterday, a Ministry of Agriculture official said it was not yet confirmed if Vice-Minister Qi Jingfa - whose portfolio includes poultry and fish - would attend the summit. Dr Yeoh said the three-pronged strategy that Hong Kong was using to combat the H5N1 virus - increased biosecurity in farms, vaccination for all imported chickens from the mainland and rest days in the markets - was effective. But he said Hong Kong needed to be alert because bird flu was spreading fast in seven neighbouring countries. He had asked the Agriculture, Fisheries and Conservation Department to step up surveillance of wild birds and migratory birds that may carry the virus and to watch out for any possible mutation of the virus to make sure vaccines continued to be effective. But Dr Yeoh said Hong Kong was unlikely to have an outbreak because 70 to 80 per cent of chickens that had been vaccinated for H5N1 developed antibodies.