Cheung Sha Wan Wholesale Poultry Market, put on protective equipment will bare hands to catch live chickens into the green plastic buckets, plastic barrels from the carbon monoxide into the hole, suffocated to death by chickens.
Yuen Long farm bird flu outbreak in parts of the chickens injected with a vaccine can not escape death, caused by the use of the vaccine in Hong Kong over the years have lapsed into question. World Organization for Animal Health (OIE) statistics show that in 2008 the global total of 28 local outbreak of avian flu, 27 of them, including four in Hong Kong from the Mainland, Thailand, South Korea, Japan, Cambodia and Vietnam, Russia to the north, Ukraine and other regions of the cases were found to have H5N1 virus (see table right), but it still is not widely used in recent years against the H5N2 vaccine.
"The new infectious disease of animals and found that the Scientific Committee" (hereinafter referred to as the Science and Technology Council) member Lo Wing-lok said earlier this year, the Committee was meeting to ask the Government whether the H5N2 vaccine effective, to replace the need for vaccines, but the reply was "still valid" He may say that if the government failed to prepare for the replacement of vaccine, is "trying to be."
Food and Health Secretary York Chow said yesterday that Hong Kong used in vaccines against H5N2 virus has been 6 years, during which the virus or change, the Council has asked the Mainland, Hong Kong and Japan to study, to observe whether there is a need to use vaccines against H5N1.
York Chow: there is a change in the virus or with the Mainland
Hong Kong University microbiology professor Yuen Kwok-yung visit to this paper revealed that in June this year in the Sham Shui Po chicken stalls in the market to find the bird flu virus samples belonging to H5N1, in October this year in the Sham Shui Po seized the crow family birds within the body also have H5N1, At present, it is manufactured in the Netherlands in use Farms H5N2 vaccine, vaccine effectiveness of the decline is not surprising.
He was referring to the infected chicken farm is a signal that the authorities should consider the need to convert the vaccine, and the development of the mainland's vaccine against the H5N1 virus genotype, with the recent discovery of more together, it could be considered, but to determine the vaccine The effectiveness of how much he mean to test the complex, as a result of Hong Kong to prevent the whole South China's bird flu epidemic.
Lo Wing-lok believe that the virus will mutate, a vaccine I can not, from time to time he would ask the Government whether H5N2 vaccine is still effective, is the answer to be degrees of serum resistance of more and more weak, Science and Technology Commission will meet at the beginning of this year, the government still says H5N2 An effective vaccine.
Food and Health Bureau spokesman denied late, York Chow has also pointed out that the mainland as a result of the virus, North and South are also other, the mainland is to improve the work done, once the virus found in Hong Kong and the Mainland together will be handed over to the Mainland Laboratory studies suggest that the H5N1 vaccine for chickens in Hong Kong is more protective, Hong Kong will be chosen to pilot trial, H5N1 and H5N2 vaccines cheaper than the price.
Director-General of the World Organization for Animal Health Adviser Tillman (Dr Alex Thierman) long-distance telephone interview with this paper that popular around the world to H5N1 avian influenza virus mainly, but both H5N1 and H5N2 vaccines are cross-protective effect, as Which vaccine injection, the region will depend on the outbreak of the avian influenza virus which belongs to type, can not be generalized.
Experts: to monitor the vaccine before six months
Tillman said that if the vaccine began to fail to consider the conversion of new vaccines, but preparation before moving on to new vaccines, the department must test the farm for six months or closely monitor the situation, a new understanding of the effectiveness of vaccines in poultry, only to replace The new vaccine. OIE recommends that only the outbreak of bird flu high-risk areas, or a threat to adjacent areas of poultry vaccinated. It is understood that Japan not to vaccinate poultry, Vietnam is promising to vaccinate poultry.
Agriculture, Fisheries and Conservation Department of Hong Kong chicken farms continue to take samples to determine whether other farm chickens infected with avian flu. The virus is being propagated to the current testing chickens to prevent the effectiveness of the vaccine, it takes one to two months.
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