Experts say human infection with highly pathogenic avian influenza outbreaks and poultry without necessarily

2009-02-06 20:18
Source: Ministry of Agriculture

Experts say human infection with highly pathogenic avian influenza outbreaks and poultry without necessarily

Journalist us hearing from the Ministry of Agriculture was informed that at present China's bird flu in poultry immune condition, the recent large-scale epidemic outbreak will not. From the Ministry of Agriculture reported the fall of 2008 to focus national immunization as well as a general inspection of the actual laboratory testing situation, the avian flu immunization antibody density and the pass rates exceed the national standards, on the whole were higher than in previous years. As a result of immunization, such as prevention and control measures in place, our country only in 2008 in Tibet, Guizhou, Guangdong occurred from 6 highly pathogenic avian influenza epidemic, the incidence of poultry 09,000, 09,000 deaths, 590,000 killed; incidence, the same period last year deaths are substantially reduced. No outbreaks of migratory birds. Since June 2008, the National also did not happen of highly pathogenic avian flu.

Recently in Beijing, Shanxi, Shandong, Hunan, and other emerging human infection of highly pathogenic avian influenza cases, but did not happen the local poultry outbreak of bird flu. Chinese Academy of Engineering, bird flu prevention and control expert, Professor Liu Xiufan Yangzhou University and the National Avian Influenza Reference Laboratory director Chen Hualan researcher recently told reporters, human case of bird flu occurred in poultry and non-occurrence of the epidemic situation in the world, more common, China has so far occurred in 38 cases of human infection with highly pathogenic avian influenza cases, only four cases have poultry outbreaks over the same period, the majority of poultry outbreaks and are not directly linked to some cases and even no obvious history of exposure to poultry.

According to Liu Xiufan introduction, human infection with highly pathogenic avian influenza have a number of ways, first contact with infected poultry; second is exposure to infected wild birds; Third, exposure to virus contaminated objects (food) and other goods and links. So far, 14 countries, more than 400 people infected with highly pathogenic avian influenza, multi-linked to the consumption of or contact with the avian flu virus contaminated objects (food) goods, but also have a certain number of patients with unknown infection.

Xiu-Fan Liu and Chen Hualan two experts believe that avian influenza viruses in general not easy to cause infection, from the current situation of man infected with highly pathogenic avian influenza cases are sporadic cases. This has recently been emerging for several cases of human infection of highly pathogenic avian influenza cases, from the locations and causes of morbidity, as well as analysis of epidemiological investigations, there is no correlation between the cases. Since 2003, the world's millions of poultry and wild birds infected with the H5N1 avian influenza virus through plant breeding, farm, forest, laboratories and so on, these animals and human contacts, at least millions of times, but a few In person infected with highly pathogenic avian influenza, only 403 cases that exposed the crowd, only a small number of people susceptible to the avian flu virus. It is worth noting that so far China has not yet been found breeding and veterinary personnel infected with avian flu cases. The current findings of the avian flu virus do not have the conditions for person to person, so the public do not have to worry too much.

Two experts think, China's prevention and control of highly pathogenic avian influenza in poultry largely through the implementation of compulsory vaccination and culling a combination of measures, this is the World Organization for Animal Health (OIE) recommended effective measures to control the epidemic. Immune response to the issue of public concern, CHEN Hua-lan explained that immunization is the prevention of bird flu in poultry is very effective measures. Although the vaccine should not directly kill the virus, but immunization can prevent HIV infection in poultry, can inhibit the detoxification of poultry virus, thus greatly reducing the environmental load of virus. In accordance with the laws of the epidemiological analysis, in a good immune status, the flocks can produce effective protection force, there will be no large-scale epidemic. And though the bird flu virus mutates rapidly, but as long as the timely use of vaccines targeted for immunization, we can effectively prevent the outbreak. For example, in江苏东台, MSC and other places to detect bird flu virus mutation, Jiangsu, Zhejiang, Shanghai, Anhui, Shandong and other places a timely manner for the use of variant virus vaccine immunization, poultry will soon have a protection force to stop the spread of the epidemic. Worthy of note is that the virus in the natural environment there are many conditions for the existence of. First, objectively speaking, regardless of immunization efforts, is always difficult to achieve all poultry in the state of effective protection. Second, wild birds can not be immune. Third, the virus in contaminated items can survive a certain period of time, especially in the winter cold season, for example, in guano in the virus can survive for several months. Poultry in such circumstances may not have the disease, but the environment has the virus exist, and poultry, there was risk of infection.

Xiu-Fan Liu and Chen Hualan two experts also said that the current avian flu around the world in research there are many unknown areas, such as avian influenza virus to mammals, as well as what is causing infections, avian influenza virus in mammals and its variation mechanism of between (in particular, between) whether the level of dissemination of research are currently hot. The next step should be to strengthen the veterinary and health system joint research, focus on avian influenza virus infection mechanism, to figure out who is currently infected with the avian flu virus biological properties. In addition, the development of high efficiency can be used for human infection with avian influenza vaccine immunization is the research hot spots.

They also make recommendations, due to the frequent flow of poultry and its products, the transaction volume is very large, to prevent the occurrence of highly pathogenic avian influenza epidemic, blocking the spread of the virus to people, the relevant departments of live birds is necessary to strengthen market supervision, strict implementation of disinfection and closed system to prevent the listing of poultry died of the disease, strengthening disease monitoring of live poultry market. Consumers to purchase in the formal market, pass the quarantine inspection of poultry products.