Newcastle disease and avian influenza are highly contagious diseases caused by viruses, which can occur all year round, and both occur frequently in winter and spring. The differential diagnosis is introduced as follows.
First, susceptible animals
1. Newcastle disease in chickens: it is caused by paramyxovirus, and the susceptible animal is chicken, and the mortality rate is higher than that of chicken avian influenza.
2. Chicken avian influenza: caused by influenza A virus, it has the characteristics of rapid epidemic and long duration, and has certain mutual sensitivity to poultry, and chickens, ducks, geese and other poultry are susceptible to infection.
Second, the clinical symptoms
1. Newcastle disease: (1) Breathing with rales, and making gurgling and wheezing sounds; (2) Paralysis of the legs and trembling of the head; (3) The appetite and drinking water decreased, and the feces were green.
2. Chicken avian influenza: (1) The head is swollen, the comb and the flesh are cyanotic, and purple bleeding spots appear on the foot scales; (2) Diarrhea, with green or yellow-green feces, and mortality ranging from 5% to 30% is a characteristic symptom; (3) Some chickens mainly have respiratory disorders, and the respiratory symptoms of chicks are more serious.
Third, the autopsy changes
1. Newcastle disease: (1) Papillary hemorrhage of glandular gastric mucosa; (2) Duodenal ulcer, small intestinal mucosa with round or jujube necrotic ulcer focus, cloaca congestion and bleeding; (3) Cecal tonsil ulcer.
2. Chicken avian influenza: (1) gray-white necrosis of myocardium; (2) The pancreas has gray necrotic spots; (3) The digestive tract has pathological changes similar to Newcastle disease, especially the swelling and bleeding of adenogastric papillae.But unlike Newcastle disease, there is no ulcer in duodenum and cecum tonsil. (4) The mature follicles of laying hens are congested and bleeding, and there are common specific lesions such as oozing or rupture of yolk, follicular hematoma and deformation in abdominal cavity.
Fourth, differential diagnosis
According to the epidemic situation, clinical symptoms and autopsy changes, a preliminary differential diagnosis was obtained. In addition, red blood cell hemagglutination test can be used for qualitative identification, that is, chicken red blood cell hemagglutination test both agglutinate, goat red blood cell agglutination test chicken Newcastle disease does not agglutinate, chicken avian influenza agglutinate.
V. Prevention and control measures
1. Put an end to pathogens invading chickens and strictly implement the disinfection system. Disinfectants should be selected from reputable and quality-oriented manufacturers with broad bactericidal spectrum, quick action, no corrosiveness, less residue and convenient use. Such as Baidu Sha, Nongfu No.5 and so on.
2. Make a reasonable immunization program for chickens and do a good job in vaccination. We can choose Newcastle disease strain I or strain IV vaccine and avian influenza multivalent inactivated vaccine to strengthen the resistance of chickens for many times.
3. Once the suspected epidemic disease is found, timely detect and diagnose and handle the dead chickens. And emergency prevention and control of threatened chickens to prevent the spread of the epidemic and secondary infection. You can choose: (1) inject 2-3 ml of highly immunized yolk antibody against Newcastle disease and avian influenza into the muscle per kilogram of body weight for 2-3 days; (2) Mixed drinking of Liduwei: 200kg of water per 100g of this medicine for 2-4 days; (3) Ganteke mixed drink: administration according to weight,The therapeutic dose is 0.2-0.3 ml per kilogram of body weight. ④ Hulasha mixed drink: 120kg of drinking water per 100g of this medicine. Wu Shujun Shi Weiling (Zhejiang Dafeilong Animal Health Products Co., Ltd.)
Excerpted from the 8th issue of Feed Wide Angle in 2003.

　　The reference news network reported on October 21. According to the zweites deutsches fernsehen website reported on October 18th, while the third Belt and Road International Cooperation Summit Forum was held, China announced that its economy grew by 4.9% year-on-year in the third quarter. This increase exceeded expectations. It seems that this is a rising signal at the right time.

　　According to the report, although there are still uncertainties in China’s economy, several major US banks, including Goldman Sachs, JPMorgan Chase and Citibank Group, significantly raised their forecasts for China’s economy on the 18th. They believe that China’s economy will recover.

　　These most influential financial institutions in the world predict that China’s economic growth will exceed 5% in 2023. This means that China’s economic growth this year may once again be in the forefront of all industrialized countries and newly industrialized countries. This alone shows that the world’s second largest economy is still of great importance.

　　According to an American business insider website reported on October 19th, Moody’s, a major American bank and rating agency, believes that China’s economy is about to recover. The most influential financial institutions in the world raised the forecast of China’s economic growth in 2023 to 5% and above on the 18th.

　　According to the report, the obviously better-than-expected economic data triggered new optimism about China. Citigroup and Goldman Sachs currently expect China’s GDP to grow by 5.3% this year. JPMorgan Chase predicted that China’s economy would grow by 5.2% this year. JPMorgan Chase wrote that the data in August and September were better than expected, "which is encouraging".

　　Max Zenlein, chief economist of Mercator China Institute, said: "China’s economic model is in a transitional stage, and the government consciously accepts lower GDP growth." He also said that the government hopes that future growth will be promoted by areas that meet national goals, including relying more on high technology. Cenlein believes: "This transformation is not smooth sailing, but China’s economy is not in a crisis mode."

　　On October 20th, the South China Morning Post said in an editorial entitled "New GDP data gives China every reason to see the bright side" that investors have seen encouraging signs of strong recovery. No matter how to interpret the latest GDP data of China, doomsday theorists who predict that the sky will fall will keep silent.

　　The article said that China’s GDP growth in the third quarter exceeded market expectations because consumption rebounded and industrial production stabilized when the government took measures to boost growth. As China’s economy resumed its growth momentum, many analysts were surprised at the extent of its growth. Almost all aspects of consumer spending are increasing.

　　The article said that the latest data shows that Beijing’s growth target of around 5% this year is within reach. We have reason to be optimistic. Given the encouraging GDP data, Beijing will undoubtedly have more confidence in achieving its growth targets and will pay attention to the prospects for next year.

　　The article points out that up to now, many foreign "experts" still know very little about the size and complexity of China, the world’s second largest economy, and they are likely to rave about China’s economy. At the same time, China’s economy will advance in ups and downs like any major market in the world.

　　According to a report on the website of Bloomberg News on October 18th, the GDP data released by China shows that the worst period has passed as consumption drives the economic rebound.

　　Zhou Hao, chief economist of Guotai Junan International, said: "In the short term, at least one thing is clear: China’s growth has basically bottomed out. The momentum of economic growth has swept away some clouds at least in the short term. "

　　The report believes that this judgment also applies to the world economic situation. The International Monetary Fund announced last week that it would keep its global growth forecast unchanged this year, and slightly lowered its growth forecast for next year. The latest data of China’s economy can ease people’s worries about the further global recession. (Compile/Nie Litao, Wu Mei, Wang Dongdong)