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african swine fever and meat prices fluctuation:An empirical study in China based on TVP-VAR model

Journal of Integrative Agriculture 2021年第8期20卷 2289-2301页

作者： LI Hui-shang HU Chen-pei LÜZheng LI Mei-qi GUO Xin-zhu Agricultural Information Institute/Key Laboratory of Big Agri-Data of Ministry of Agriculture and Rural Affairs Chinese Academy of Agricultural SciencesBeijing 100081P.R.China International Statistical Information Center National Bureau of StatisticsBeijing 100826P.R.China School of Statistics and Mathematics Central University of Finance and EconomicsBeijing 100081P.R.China

african swine fever(ASF),a fatal disease outbroken in China in August 2018,has widely attracted social concern especially in the information *** occurrence of ASF led to an imbalance between supply and demand in pork and other meat *** a result,meat prices fluctuated greatly during the past year in *** measure ASF quantitatively,the internet public concern index about ASF was created using web crawler *** relationships between ASF and meat prices were analyzed based on time-varying parameter vector auto-regressive(TVP-VAR)*** results showed that there were some differences in the impact size,direction and duration of ASF on the prices of pork,chicken,beef and mutton,and the characteristics of time variability and heterogeneity were *** the same time,the impact of ASF on meat prices is not consistent with the trend and degree of *** impulse intensity is strongly correlated with the strength and duration of ASF,and it is generally weak in the early stage and much stronger in the middle and late *** results indicate that macro regulations,monitoring and early-warning system,standardizing production and circulation,and the public opinion monitoring and guidance about ASF should be given more attention in future to stabilize the market expectations and to promote a smooth functioning of the livestock markets.

关键词： african swine fever meat prices dynamic transmission TVP-VAR model

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Optimal design of culling compensation policy under the african swine fever——Based on simulations of typical pig farms in China

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Journal of Integrative Agriculture 2023年第2期22卷 611-622页

作者： GUO Shi-juan Lü Xin-ye HU Xiang-dong Institute of Agricultural Economics and Development Chinese Academy of Agricultural SciencesBeijing 100081P.R.China Institute of Agricultural Information and Economy Shandong Academy of Agricultural SciencesJinan 250000P.R.China

This paper aims to optimize the culling compensation policy from a micro perspective through scenario *** on an investigation of 273 pig farms in eight regions,four typical pig farms were constructed according to farm size and breeding mode,representing the swine producers in ***,a decision objective function of pig farms facing suspected african swine fever(ASF)outbreaks was *** study used a mathematical programming model to design and simulate scenarios based on compensation standards and local implementation levels,aiming to incentivize pig farms to report *** results show that the optimal decisions on epidemic reports differed among typical farms and by herd daily *** results suggest the following adjustments for optimizing culling compensation policies:(1)to set culling compensation standards based on the market value and(2)to maintain a high level of epidemic surveillance capability in the animal husbandry and veterinary sector.

关键词： culling compensation african swine fever epidemic report mathematical programming model

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Establishment of an indirect immunofluorescence assay for the detection of african swine fever virus antibodies

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Journal of Integrative Agriculture 2024年第1期23卷 228-238页

作者： Wan Wang Zhenjiang Zhang Weldu Tesfagaber Jiwen Zhang Fang Li Encheng Sun Lijie Tang Zhigao Bu Yuanmao Zhu Dongming Zhao State Key Laboratory for Animal Disease Control and Prevention National African Swine Fever Para-reference LaboratoryNational High Containment Facilities for Animal Diseases Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin 150069China College of Veterinary Medicine Northeast Agricultural UniversityHarbin 150069China

african swine fever(ASF)continues to cause enormous economic loss to the global pig *** there is no safe and effective vaccine,accurate and timely diagnosis of ASF is essential to implement control *** immunofluorescence assay(IFA)is a gold standard serological method recommended by the World Organization for Animal Health(WOAH).In this study,we used primary fetal kidney cells to establish a wild boar cell line(BK2258)that supported the efficient replication of ASF virus(ASFV)SD/DY-I/21 and showed visible cytopathic effect(CPE).Moreover,using BK2258,we established a sensitive and specific IFA for ASFV antibody *** standardize and evaluate the performance of this assay,we used serum samples from pigs infected with the low virulent genotype I SD/DY-I/21 and genotype II HLJ/HRB1/20,and immunized with the vaccine candidate HLJ/18-7GD,field samples,and negative serum *** IFA reacted with the ASFV-positive sera and displayed bright fluorescence *** was no non-specific green fluorescence due to cellular senescence or other cell damage-causing *** to a commercial indirect enzyme-linked immunosorbent assay(iELISA),ASFV antibodies were detected 1–4 days earlier using our *** detection limits of the IFA and iELISA for the same ASFV-antibody positive serum samples were 1:25,600 and 1:6,400,respectively,indicating that the IFA is more sensitive than *** newly established IFA was highly specific and did not cross-react with sera positive for six other important porcine pathogens(i.e.,Classical swine fever virus(CSFV),Porcine reproductive and respiratory syndrome virus(PRRSV),Porcme circovirus type 2(PCV2),Pseudorabies virus(PRV),Foot-and-Mouth disease virus type O(FMDV/O),and Porcine epidemic diarrhea virus(PEDV)).This study thus provides a sensitive,specific,and reliable detection method that is suitable for the serological diagnosis of ASF.

关键词： african swine fever antibody IFA serological method

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A seven-gene-deleted african swine fever virus is safe and effective as a live attenuated vaccine in pigs

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Science China(Life Sciences) 2020年第5期63卷 623-634页

作者： Weiye Chen Dongming Zhao Xijun He Renqiang Liu Zilong Wang Xianfeng Zhang Fang Li Dan Shan Hefeng Chen Jiwen Zhang Lulu Wang Zhiyuan Wen Xijun Wang Yuntao Guan Jinxiong Liu Zhigao Bu State Key Laboratory of Veterinary Biotechnology Harbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin 150001China National High Containment Laboratory for Animal Diseases Control and Prevention Harbin 150069China

african swine fever(ASF)is a devastating infectious disease in swine that is severely threatening the global pig *** efficacious vaccine is urgently ***,we used the Chinese ASFV HLJ/18 as a backbone and generated a series of genedeleted *** virulence,immunogenicity,safety,and protective efficacy evaluation in specific-pathogen-free pigs,commercial pigs,and pregnant sows indicated that one virus,namely HLJ/18-7GD,which has seven genes deleted,is fully attenuated in pigs,cannot convert to the virulent strain,and provides complete protection of pigs against lethal ASFV *** study shows that HLJ/-18-7GD is a safe and effective vaccine against ASFV,and as such is expected to play an important role in controlling the spread of ASFV.

关键词： african swine fever vaccine safety protective efficacy pig

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african swine fever:an unprecedented disaster and challenge to China

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Infectious Diseases of Poverty 2018年第1期7卷 1172-1176页

作者： Tao Wang Yuan Sun Hua-Ji Qiu State Key Laboratory of Veterinary Biotechnology Harbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin 150069China

Background:african swine fever(ASF),caused by african swine fever virus,is a hemorrhagic and often fatal disease of domestic pigs and wild boar,which is notifiable to the World Organization for Animal *** August 3,2018,China reported the first outbreak of ASF in Shenyang,a northeastern city of *** of October 8,a total of 33 ASF outbreaks were reported in eight provinces in China,the biggest pork producer and consumer in the *** body:This commentary summarizes the current situation of ASF in China,measures that China has taken to control the disease,lessons learnt from other countries,challenges and recommendations on ASF control in China,and possible international collaborations on ***:ASF is an unprecedented disaster and challenge to the Chinese swine *** will be a formidable and protracted campaign to control ASF in China,which requires joint participation and coordination of stakeholders and agencies at different levels.

关键词： african swine fever Control China

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Advances in research on the efficacy of traditional Chinese herbal medicine in combating african swine fever

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ANIMAL DISEASES 2024年第1期4卷 19页

作者： Yang, Yuwei Zhao, Ya Zhang, Qiang Jin, Meilin Huazhong Agr Univ Coll Vet Med Wuhan Peoples R China Hubei Jiangxia Lab Wuhan 430200 Peoples R China

african swine fever (ASF) is a highly contagious disease of domestic and wild pigs caused by african swine fever virus (ASFV). The mortality rate associated with ASF is remarkably high, almost approaching 100%. Since the introduction of ASF into China in 2018, its rapid spread has caused marked economic losses in the country's swine industry. To date, there are no safe and effective commercial vaccines or antiviral drugs against ASF;thus, there is an urgent need to develop novel prevention and control strategies. Traditional Chinese medicine (TCM), which comprises various herbs that are abundant in various potential functional components, holds great promise for the prevention and control of ASF. Here, we provide a comprehensive review of the advancements in TCM and the effects of its compound formulas against ASF, including the antiviral abilities, immunoregulatory activities, and practical application of these formulas for the prevention and control of ASF. We specifically examined the potential and constraints of natural product-derived extracts and TCM formulas in combating ASFV. This review aims to offer insights and ideas for the holistic management and containment of ASF.

关键词： african swine fever Traditional Chinese medicine Herbal medicine Pig farming Disease prevention

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Tradeoffanalysis of the pork supply and food security under the influence of african swine fever and the COVID-19 outbreak in China

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Geography and Sustainability 2022年第1期3卷 32-43页

作者： Huizong Yao Chuanfu Zang Xiaoxing Zuo Yuyang Xian Yongquan Lu Yutong Huang Xianbing Li Chinese Research Academy of Environmental Sciences Beijing 100012China School of Geography South China Normal UniversityGuangzhou 510631China South University of Science and Technology of China Shenzhen 518055China

China is the world’s largest consumer of pork and ***,african swine fever(ASF)and the COVID-19 outbreak have greatly impacted the pork supply and food security in *** can food security and the pork supply be ensured under the dual impacts of COVID-19 and ASF?This is a major problem to be urgently solved by the Chinese *** study indicated that the main pork production and sales areas in China were separated,which reflected the spatial imbalance between the supply and *** total area of suitable selected sites for pig farms in China is 21.5 million *** only the areas with levels of high and moderate suitability are considered as potential sites for pig farms,the potential pork production can reach 56.1 million tons in China,which is slightly lower than *** to the impact of the ASF epidemic,the food consumed by pigs has been reduced by 34.7 million ***,with increasing pork productivity in the future,the self-sufficiency rate of grains may further *** the premise that the quality of people’s life is not affected,the diversification of meat supply channels should be realized in an orderly and sustainable way,which might alleviate the pressure on food *** study provides a theoretical reference for the spatiotemporal layout of the swine industry and addresses the issue of food security in China under the influence of ASF and the COVID-19 outbreak.

关键词： african swine fever COVID-19 outbreak Suitability analysis Food security Pork production potential

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Big government:The fight against the african swine fever in China

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Journal of Biosafety and Biosecurity 2020年第1期2卷 44-49页

作者： Yufeng Ding Yanli Wang Nanjing Agricultural University China Nanjing Audit University China

The african swine fever(ASF)outbreak in China triggered a series of issues such as false drug and vaccine sales,insufficient pork supply,and panic among pig *** the largest pig breeder in the world,China suffered and continues to endure the damages and other impacts brought by this fatal porcine ***,the country performed well in the process of preventing and controlling the spread of the ASF,which was confirmed and appraised by the Director-General of the World Organisation for Animal *** hold the epidemic under control,China needs to focus on three key factors:the powerful government with the sole leadership of CPC to allocate all the resources available,referred to hereby as big government;comprehensive measures to effectively prevent disease propagation;and recover pig production capacity with firm and resolute determination to eliminate the *** elements have contributed to China’s success in overcoming many difficulties in the past and worked well so far for preventing ***,shortcomings,such as untimely responses,low tolerance for mistakes,surrender of local responsibility,lack of shared value focus,etc.,should be overcome in the big government mode,which may serve as a non-negligible part of the whole reference for other countries.

关键词： african swine fever Chinese Government Big Government Prevention and control

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Development of a chromatographic lateral flow immunoassay for detection of african swine fever virus antigen in blood

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Animal Diseases 2022年第3期2卷 139-153页

作者： Daniel W.Madden Sun-Young Sunwoo Natasha N.Gaudreault Jessie D.Trujillo Igor Morozov Carmina Gallardo Juergen A.Richt Department of Diagnostic Medicine/Pathobiology College of Veterinary MedicineKansas State UniversityManhattanKSUSA Centro de Investigación en Sanidad Animal(CISA-INIA/CSIC) MadridSpain

african swine fever(ASF)is a highly lethal disease of domestic and wild swine caused by african swine fever virus(ASFV).The disease currently circulates in Africa,Europe,Asia and on the island of *** ongoing epizootics in Europe and Asia have produced millions of animal deaths and severe economic *** effective vaccine is available for ASF,making rapid and accurate detection of ASFV essential for disease mitigation *** available diagnostics for ASFV possess significant limitations related to assay performance,deployability,and/or turn-around time;therefore there is an unmet need for pen-side diagnostic tests with sufficient sensitivity and specificity.A chromatographic lateral flow immunoassay(LFIA)was developed for the detection of ASFV antigen in EDTA-treated whole blood using monoclonal antibodies targeting the viral p30 *** assay requires only water to perform and provides results in 25 min,making it well-suited for field *** LFIA was capable of detecting genotype I and genotype II strains of ASFV in EDTA blood from experimentally infected pigs at varying time-points after infection,though it was unable to detect a genotype X ASFV *** sensitivity correlated with clinical disease severity,body temperature,and viral DNA levels,and was over 90%in animals showing moderate to severe ASF-related symptoms after challenge with virulent genotype II *** LFIA also showed a robust diagnostic specificity of over 98%,which is essential to field testing for a high consequence to foregin animal *** LFIA targeting the viral p30 protein can reliably detect ASFV in whole blood from animals showing moderate to severe clinical signs of infection with virulent genotype I and II isolates,making it a promising candidate for use as a field-deployable antigen detection *** evaluation using field samples and different virus strains is required to further assess the utility of this rapid diagnostic test.

关键词： african swine fever Lateral flow immunoassay Point of care diagnostics

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Current research progress on the viral immune evasion mechanisms of african swine fever virus (vol 4, 18, 2024)

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ANIMAL DISEASES 2024年第1期4卷 18页

作者： Weng, Changjiang Chinese Acad Agr Sci CAAS Harbin Vet Res Inst Div Fundamental Immunol Natl African Swine Fever Para Reference LabState Harbin 150069 Peoples R China Heilongjiang Prov Key Lab Vet Immunol Harbin Heilongjiang Peoples R China

african swine fever (ASF), caused by the ASF virus (ASFV), is an acute, severe, and highly contagious infectious disease in domestic pigs and wild boars. Domestic pigs infected with a virulent ASFV strain can have morbidity and mortality rates of up to 100%. The epidemic of ASF has caused serious economic losses to the global pig industry. Currently, there is no safe and effective vaccine or specific drug for treating ASF. Therefore, ASFV still poses a great threat to pig factories. ASFV is a double-stranded DNA virus with a complex icosahedral multilayer structure. The ASFV genome contains 150–170 open reading frames (ORFs) that encode 150–200 proteins. Some ASFV-encoded proteins are involved in virus invasion, genome replication, DNA repair, and virion formation. Some ASFV proteins execute immunomodulatory functions by regulating the host antiviral innate immune response. Accumulating studies have shown that the immunomodulatory functions of ASFV genes are closely related to the virulence and pathogenicity of ASFV isolates. This review summarizes the research advances on ASFV immune evasion mechanisms in african swine fever patients and provides new insights for developing attenuated live vaccine candidates to prevent and control ASF.

关键词： african swine fever Antiviral innate immune responses Immunoregulatory gene Live attenuated vaccines

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