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Abdallah Mouhamed A, Lee J, Kim DH, Song CS. Comparative protective efficacy of a newly generated live recombinant thermostable highly attenuated vaccine rK148/GVII-F using a single regimen against lethal NDV GVII.1.1. Avian Pathol 2024; 53:14-32. [PMID: 38009206 DOI: 10.1080/03079457.2023.2263395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 09/20/2023] [Indexed: 11/28/2023]
Abstract
RESEARCH HIGHLIGHTS A thermostable, safe, and effective NDV GVII recombinant vaccine was generated.Fusion gene replacement with GVII did not affect GI K148/08 virus thermostability.Strain rK148/GVII-F provided adequate protection against a lethal NDV challenge.Oropharyngeal shedding was significantly reduced on post-challenge days 5 and 7.
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Affiliation(s)
- Amal Abdallah Mouhamed
- Department of Avian Diseases, Animal Health Research Institute, Agriculture Research Center, Giza, Egypt
- Department of Avian Disease and Infectious Disease, College of Veterinary Medicine, Konkuk University, Seoul, Republic of Korea
| | - Jiho Lee
- Department of Avian Disease and Infectious Disease, College of Veterinary Medicine, Konkuk University, Seoul, Republic of Korea
| | | | - Chang-Seon Song
- Department of Avian Disease and Infectious Disease, College of Veterinary Medicine, Konkuk University, Seoul, Republic of Korea
- KHAV Co. Ltd., Seoul, Republic of Korea
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2
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Babaeimarzangou SS, Molouki A, Talebi A, Allymehr M, Allahyari E, Soltani M. Molecular characterization and phylogenetic study of the hemagglutinin-neuraminidase gene of newcastle disease virus isolated from peacock (Pavo cristatus) and Turkey (Meleagris) and its comparison with broiler isolates. Arch Microbiol 2023; 205:253. [PMID: 37254016 DOI: 10.1007/s00203-023-03592-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 05/05/2023] [Accepted: 05/18/2023] [Indexed: 06/01/2023]
Abstract
Newcastle disease has been endemic within the Iranian poultry industry for decades. However, the genetic nature of the circulating Hemagglutinin-Neuraminidase (HN) gene among Iranian domesticated bird populations is broadly unexplored. The presented study was carried out to gain insights into the biological and molecular characterization of four complete HN genes isolated from turkey, peacock, and broiler isolates in Iran between 2018 and 2020. The phylogenetic analysis revealed that the isolates belong to the Newcastle disease virus (NDV) subgenotype VII.1.1, previously known as VIIL. Further analysis demonstrated the thermostable substitutions S315P and I369V within the isolates. Finding the N-glycosylation site (NIS) at positions 144-146 and the cysteine residue 123 might influence the fusogenicity abilities of the isolates, while identification of multiple amino acid substitutions in both antigenic sites, especially I514V and E347Q, and the binding sites of the HN protein, raised concern about the pathogenicity of the isolates. In addition, the annual rate of change based on the HN gene of Iranian NDV was calculated at about 1.8088E-3 between 2011 and 2020. In conclusion, a new NDV variant with multiple site mutagenesis is circulating not only among chickens but also in turkey and captive birds such as peafowls, and failure of routine vaccination programs could be attributed to the differences between circulating NDV strains and those used in vaccine manufacturing. Therefore, future legislation aimed at providing vaster vaccination cover and biosecurity plans will be needed to control the spread of circulating NDV strains.
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Affiliation(s)
- Seyed Sajjad Babaeimarzangou
- Division of Poultry Health and Diseases, Department of Clinical Sciences, Faculty of Veterinary Medicine, Urmia University, Urmia, Iran.
| | - Aidin Molouki
- Department of Avian Diseases Research and Diagnostics, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.
| | - Alireza Talebi
- Division of Poultry Health and Diseases, Department of Clinical Sciences, Faculty of Veterinary Medicine, Urmia University, Urmia, Iran
| | - Manochehr Allymehr
- Division of Poultry Health and Diseases, Department of Clinical Sciences, Faculty of Veterinary Medicine, Urmia University, Urmia, Iran
| | | | - Mohammad Soltani
- Graduated from Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
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Characterization of a Recombinant Thermostable Newcastle Disease Virus (NDV) Expressing Glycoprotein gB of Infectious Laryngotracheitis Virus (ILTV) Protects Chickens against ILTV Challenge. Viruses 2023; 15:v15020500. [PMID: 36851714 PMCID: PMC9959528 DOI: 10.3390/v15020500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 02/05/2023] [Indexed: 02/15/2023] Open
Abstract
Infectious laryngotracheitis (ILT) and Newcastle disease (ND) are two important avian diseases that have caused huge economic losses to the poultry industry worldwide. Newcastle disease virus (NDV) has been used as a vector in the development of vaccines and gene delivery. In the present study, we generated a thermostable recombinant NDV (rNDV) expressing the glycoprotein gB (gB) of infectious laryngotracheitis virus (ITLV) based on the full-length cDNA clone of the thermostable TS09-C strain. This thermostable rNDV, named rTS-gB, displayed similar thermostability, growth kinetics, and pathogenicity compared with the parental TS09-C virus. The immunization data showed that rTS-gB induced effective ILTV- and NDV-specific antibody responses and conferred immunization protection against ILTV challenge in chickens. The efficacy of rTS-gB in alleviating clinical signs was similar to that of the commercial attenuated ILTV K317 strain. Furthermore, rTS-gB could significantly reduce viral shedding in cloacal and tracheal samples. Our study suggested that the rNDV strain rTS-gB is a thermostable, safe, and highly efficient vaccine candidate against ILT and ND.
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Newcastle disease burden in Nepal and efficacy of Tablet I2 vaccine in commercial and backyard poultry production. PLoS One 2023; 18:e0280688. [PMID: 36897867 PMCID: PMC10004539 DOI: 10.1371/journal.pone.0280688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 01/05/2023] [Indexed: 03/11/2023] Open
Abstract
Poultry (Gallus domesticus) farming plays an important role as an income generating enterprise in a developing country like Nepal, contributing more than 4% to the national Gross Domestic Product (GDP). Newcastle Disease (ND) is a major poultry disease affecting both commercial and backyard poultry production worldwide. There were more than 90 reported ND outbreaks in Nepal in 2018 with over 74,986 birds being affected. ND is responsible for over 7% of total poultry mortality in the country. Recent outbreaks of ND in 2021 affected many farms throughout Nepal and caused massive loss in poultry production. ND is caused by a single-stranded ribonucleic acid (RNA) virus that presents very similar clinical symptoms as Influenza A (commonly known as bird flu) adding much complexity to clinical disease identification and intervention. We conducted a nationwide ND and Influenza A (IA) prevalence study, collecting samples from representative commercial and backyard poultry farms from across the major poultry production hubs of Nepal. We used both serological and molecular assessments to determine disease exposure history and identification of strains of ND Virus (NDV). Of the 40 commercial farms tested, both NDV (n = 28, 70%) and IAV (n = 11, 27.5%) antibodies were detected in majority of the samples. In the backyard farms (n = 36), sero-prevalence of NDV and IAV were 17.5% (n = 7) and 7.5% (n = 3) respectively. Genotype II NDV was present in most of the commercial farms, which was likely due to live vaccine usage. We detected never reported Genotype I NDV in two backyard farm samples. Our investigation into 2021 ND outbreak implicated Genotype VII.2 NDV strain as the causative pathogen. Additionally, we developed a Tablet formulation of the thermostable I2-NDV vaccine (Ranigoldunga™) and assessed its efficacy on various (mixed) breeds of chicken (Gallus domesticus). Ranigoldunga™ demonstrated an overall efficacy >85% with a stability of 30 days at room temperature (25°C). The intraocularly administered vaccine was highly effective in preventing ND, including Genotype VII.2 NDV strain.
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Vaccine cold chain management and cold storage technology to address the challenges of vaccination programs. ENERGY REPORTS 2022; 8. [PMCID: PMC8706030 DOI: 10.1016/j.egyr.2021.12.039] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The outbreaks of infectious diseases that spread across countries have generally existed for centuries. An example is the occurrence of the COVID-19 pandemic in 2020, which led to the loss of lives and economic depreciation. One of the essential ways of handling the spread of viruses is the discovery and administration of vaccines. However, the major challenges of vaccination programs are associated with the vaccine cold chain management and cold storage facilities. This paper discusses how vaccine cold chain management and cold storage technology can address the challenges of vaccination programs. Specifically, it examines different systems for preserving vaccines in either liquid or frozen form to help ensure that they are not damaged during distribution from manufacturing facilities. Furthermore, A vaccine is likely to provide very low efficacy when it is not properly stored. According to preliminary studies, the inability to store vaccine properly is partly due to the incompetency of many stakeholders, especially in technical matters. The novelty of this study is to thoroughly explore cold storage technology for a faster and more comprehensive vaccine distribution hence it is expected to be one of the reference and inspiration for stakeholders.
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Abdoshah M, Hassanzadeh M, Masoudi S, Ashtari A, Yousefi AR, Partovi Nasr M. Thermoresistant Newcastle disease vaccine effectively protects SPF, native, and commercial chickens in challenge with virulent virus. Vet Med Sci 2022; 8:1539-1546. [PMID: 35353959 PMCID: PMC9297754 DOI: 10.1002/vms3.794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Background Due to the more stability and a better homogenecity in immune response, the use of thermoresistant vaccines in different chicken types has been increased. Objective This study aimed to evaluate the efficacy of a newly developed Newcastle disease vaccine (ND.TR.IR) originating from I‐2 strain in specific pathogen‐free (SPF) and native and broiler chickens. Methods Following determination of pathogenicity indices on the candidate seed, three efficacy examinations were conducted. In the first experiment, 120 1‐day‐old SPF chickens were randomly allocated to six groups and either vaccinated with ND.TR.IR via eye drop at 1, 7, and 21 days of age (V1, V7, and V21), or considered as non‐vaccinated control groups (C1, C7, and C21). At 20th post‐vaccination day, sera hemagglutination inhibition (HI) antibody titres against ND virus (NDV) were measured and then the chickens were challenged by virulent NDV (vNDV). In the second and third experiments, the efficacy of ND.TR.IR vaccine was compared to routine vaccination program (B1 and LaSota) in native and broiler chickens that were vaccinated at 10 and 20 days of age, respectively. The HI antibody titres were measured on 10, 20, 30, and 40 days of age, and also challenge efficacy test with vNDV was conducted on 30 days of age. Results The studied virus, as a vaccinal seed, complied with the pathogenicity indices of avirulent NDV and molecular identity of I‐2 strain. In the efficacy evaluation trials, the vaccinated chickens had higher HI antibody titres against NDV compared with their corresponding control chickens (p < 0.05). Results of the challenge tests indicated 95% and 100% protection against vNDV in native, SPF, and broiler‐vaccinated chickens, respectively. Conclusions The present findings indicated that administration of ND.TR.IR induced appropriate HI antibody titres against NDV in SPF, native, and broiler chickens associated with good protection in efficacy test.
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Affiliation(s)
- Mohammad Abdoshah
- Agricultural Research, Education and Extension Organization (AREEO), Razi Vaccine and Serum Research Institute, Karaj, Iran
| | - Mohammad Hassanzadeh
- Department of Poultry Diseases, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - Shahin Masoudi
- Agricultural Research, Education and Extension Organization (AREEO), Razi Vaccine and Serum Research Institute, Karaj, Iran
| | - Abbas Ashtari
- Agricultural Research, Education and Extension Organization (AREEO), Razi Vaccine and Serum Research Institute, Karaj, Iran
| | - Ali Reza Yousefi
- Agricultural Research, Education and Extension Organization (AREEO), Razi Vaccine and Serum Research Institute, Karaj, Iran
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Thermostable Vaccines in Veterinary Medicine: State of the Art and Opportunities to Be Seized. Vaccines (Basel) 2022; 10:vaccines10020245. [PMID: 35214703 PMCID: PMC8876287 DOI: 10.3390/vaccines10020245] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 01/28/2022] [Accepted: 01/28/2022] [Indexed: 12/14/2022] Open
Abstract
The COVID-19 pandemic has highlighted the weakness of the vaccine supply chain, and the lack of thermostable formulations is one of its major limitations. This study presents evidence from peer-reviewed literature on the development of thermostable vaccines for veterinary use. A systematic review and meta-analysis were performed to evaluate the immunogenicity and/or the efficacy/effectiveness of thermostable vaccines against infectious diseases. The selected studies (n = 78) assessed the vaccine’s heat stability under different temperature conditions and over different periods. Only one study assessed the exposure of the vaccine to freezing temperatures. Two field studies provided robust evidence on the immunogenicity of commercial vaccines stored at temperatures far in excess of the manufacturer’s recommended cold-chain conditions. The drying process was the most-used method to improve the vaccine’s thermostability, along with the use of different stabilizers. The pooled vaccine efficacy was estimated to be high (VE = 69%), highlighting the importance of vaccination in reducing the economic losses due to the disease impact. These findings provide evidence on the needs and benefits of developing a portfolio of heat- and freeze-stable veterinary vaccines to unleash the true potential of immunization as an essential component of improved animal health and welfare, reduce the burden of certain zoonotic events and thus contribute to economic resilience worldwide.
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8
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Ruan B, Zhang X, Zhang C, Du P, Meng C, Guo M, Wu Y, Cao Y. Residues 315 and 369 in HN Protein Contribute to the Thermostability of Newcastle Disease Virus. Front Microbiol 2020; 11:560482. [PMID: 33072019 PMCID: PMC7536312 DOI: 10.3389/fmicb.2020.560482] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Accepted: 08/20/2020] [Indexed: 12/23/2022] Open
Abstract
Thermostable Newcastle disease virus (NDV) vaccines have been widely used in areas where a “cold-chain” is not reliable. However, the molecular mechanism of NDV thermostability remains poorly understood. In this work, we constructed chimeric viruses by exchanging viral fusion (F) and/or hemagglutinin-neuraminidase (HN) genes between the heat-resistant strain HR09 and thermolabile strain La Sota utilizing a reverse genetic system. The results showed that only chimeras with HN derived from the thermostable virus exhibited a thermostable phenotype at 56°C. The hemagglutinin (HA) and neuraminidase (NA) activities of chimeras with HN derived from the HR09 strain were more thermostable than those containing HN from the La Sota strain. Then, we used molecular dynamics simulation at different temperatures (310 K and 330 K) to measure the HN protein of the La Sota strain. The conformation of an amino acid region (residues 315–375) was observed to fluctuate. Sequence alignment of the HN protein revealed that residues 315, 329, and 369 in the La Sota strain and thermostable strains differed. Whether the three amino acid substitutions affected viral thermostability was investigated. Three mutant viruses based on the thermolabile strain were generated by substituting one, two or three amino acids at positions 315, 369, and 329 in the HN protein. In comparison with the parental virus, the mutant viruses containing mutations S315P and I369V possessed higher thermostablity and HA titers, NA and fusion activities. Taken together, these data indicate that the HN gene of NDV is a major determinant of thermostability, and residues 315 and 369 have important effects on viral thermostability.
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Affiliation(s)
- Baoyang Ruan
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Xiaorong Zhang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Chengcheng Zhang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Pengyu Du
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Chengcheng Meng
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Mengjiao Guo
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Yantao Wu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Yongzhong Cao
- The Joint International Research Laboratory of Agriculture & Agri-Product Safety, Yangzhou University, Yangzhou, China
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9
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Ruan B, Liu Q, Chen Y, Niu X, Wang X, Zhang C, Guo M, Zhang X, Cao Y, Wu Y. Generation and evaluation of a vaccine candidate of attenuated and heat-resistant genotype VIII Newcastle disease virus. Poult Sci 2020; 99:3437-3444. [PMID: 32616237 PMCID: PMC7597857 DOI: 10.1016/j.psj.2020.01.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 12/29/2019] [Accepted: 01/08/2020] [Indexed: 02/03/2023] Open
Abstract
Newcastle disease, which is a highly contagious and fatal disease caused by the Newcastle disease virus (NDV), has harmed the poultry industry for decades. The administration of effective vaccines can control most outbreaks and epidemics of Newcastle disease in the world. However, vaccination failures of live attenuated vaccines becasue of storage and transportation problems have been reported. Hence, thermostable live vaccine strains, such as V4 and I-2 strains, are being used and welcomed in tropical regions such as Africa and Southeast Asia. In this study, a thermostable, attenuated vaccine candidate strain NDV/rHR09 was generated using the genotype VIII heat-resistant virulent NDV strain HR09 by the reverse genetics system. The results of the determination of the mean death time and intracerebral pathogenicity index indicated that NDV/rHR09 is lentogenic even after 15 serial passages in embryonated chicken eggs. The thermostability assessment showed that the NDV/rHR09 strain exhibited hemagglutination activity and infectivity when exposed to 56°C for 60 min. Compared with the commercially available La Sota and V4 vaccines, the NDV/rHR09 induced higher antibody titers in specific pathogen-free chickens. In addition, NDV/rHR09 conferred complete protection against virulent genotype VII NDV challenge and virus shedding from vaccinated chickens. These results suggest that NDV/rHR09 is a promising thermostable vaccine candidate strain.
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Affiliation(s)
- Baoyang Ruan
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China
| | - Qian Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China
| | - Yin Chen
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China
| | - Xiaosai Niu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China
| | - Xuefeng Wang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China
| | - Chengcheng Zhang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China
| | - Mengjiao Guo
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China
| | - Xiaorong Zhang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China
| | - Yongzhong Cao
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu, 225009, China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, 225009, China.
| | - Yantao Wu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China.
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Siddique F, Abbas R, Mahmood M, Iqbal A, Javaid A, Hussain I. Eco-epidemiology and pathogenesis of Newcastle disease in ostriches ( Struthio camelus). WORLD POULTRY SCI J 2020. [DOI: 10.1080/00439339.2020.1746220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- F. Siddique
- Department of Microbiology, Cholistan University of Veterinary & Animal Sciences, Bahawalpur, Pakistan
| | - R.Z. Abbas
- Department of Parasitology, University of Agriculture, Faisalabad, Pakistan
| | - M.S. Mahmood
- Institute of Microbiology, University of Agriculture, Faisalabad, Pakistan
| | - A. Iqbal
- Department of Parasitology, Riphah College of Veterinary Science, Lahore, Pakistan
| | - A. Javaid
- Department of Animal Nutrition, University of Veterinary and Animal Sciences, Bahawalpur, Pakistan
| | - I. Hussain
- Institute of Microbiology, University of Agriculture, Faisalabad, Pakistan
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11
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Liu T, Song Y, Yang Y, Bu Y, Cheng J, Zhang G, Xue J. Hemagglutinin-Neuraminidase and fusion genes are determinants of NDV thermostability. Vet Microbiol 2018; 228:53-60. [PMID: 30593380 DOI: 10.1016/j.vetmic.2018.11.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 11/15/2018] [Accepted: 11/16/2018] [Indexed: 01/09/2023]
Abstract
Newcastle disease (ND) caused by infections with virulent strains of Newcastle disease virus (NDV) continues to be a threat for poultry industry worldwide. The prospect of developing a thermostable and effective NDV vaccine is still highly desirable. To investigate the determinants of thermostability in NDV, we generated recombinant NDV strains by exchanging viral hemagglutinin-neuraminidase (HN) gene or by mutating the fusion (F) gene. The results showed that the HN and F protein were both determinants of NDV thermostability. With increased thermostability, the HN protein-chimeric virus showed significantly reduced neuraminidase and hemadsorption activities, but its hemolytic activity was retained. We also found that changing the amino acid in the F protein cleavage sites, affected the thermostability as well as the pathogenicity and fusogenic capacity of the virus. Taken together, our results suggest that HN and F proteins both contribute to the thermostability of NDV, and other viral biological activities change as the thermostability of the virus changes. These findings should be of benefit to the development of a thermostable and efficacious NDV vaccine.
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Affiliation(s)
- Tong Liu
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Yang Song
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Yanling Yang
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Yawen Bu
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Jinlong Cheng
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Guozhong Zhang
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Jia Xue
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China.
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Lindahl JF, Young J, Wyatt A, Young M, Alders R, Bagnol B, Kibaya A, Grace D. Do vaccination interventions have effects? A study on how poultry vaccination interventions change smallholder farmer knowledge, attitudes, and practice in villages in Kenya and Tanzania. Trop Anim Health Prod 2018; 51:213-220. [PMID: 30120706 PMCID: PMC6347585 DOI: 10.1007/s11250-018-1679-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 07/27/2018] [Indexed: 11/28/2022]
Abstract
Poultry are important for many poor households in developing countries, but there are many constraints to poultry production, including disease. One of the most important diseases of chickens is Newcastle disease (ND). Even though there are effective vaccines against this disease available in most countries, uptake by small-scale poultry keepers is often low. In this study, two areas in Kenya and Tanzania were studied, where some villages had received additional support to get vaccination and other villages had not. In Kenya, 320 households from 10 villages were interviewed, of which half of the villages had active promotion of vaccination through village-based advisors. In Tanzania, 457 households were interviewed, of which 241 came from villages that have had active support through either a project or government extension services. Knowledge about vaccines and the attitudes towards vaccinating against ND was evaluated using mixed multivariable logistic models. Results indicate that in Kenya, the most important determinants for understanding the function of a vaccine were having had support in the village and to have knowledge about ND signs, while in Tanzania gender and previous vaccine use were important in addition to having had support. Attitudes towards vaccination were mainly determined by knowledge, where more knowledge about how vaccines work in general or about ND contributed to more positive attitudes. Among Kenyan farmers that had never used the vaccine before, the amount of birds they lost to disease and predators also influenced attitudes. In conclusion, this study supports the notion that knowledge is a very important component of extension support and that simply making vaccines available may not be sufficient for high levels of uptake.
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Affiliation(s)
- Johanna F Lindahl
- International Livestock Research Institute, PO Box 30709, Nairobi, 00100, Kenya. .,Swedish University of Agricultural Sciences, Uppsala, Sweden. .,Uppsala University, Uppsala, Sweden.
| | - Jarrah Young
- Kyeema Foundation, GPO Box 3023, Brisbane, Queensland, 4001, Australia
| | - Amanda Wyatt
- International Food Policy Research Institute, 1201 Eye Street, NW, Washington, DC, 20005-3915, USA
| | - Mary Young
- Kyeema Foundation, GPO Box 3023, Brisbane, Queensland, 4001, Australia
| | - Robyn Alders
- Kyeema Foundation, GPO Box 3023, Brisbane, Queensland, 4001, Australia.,School of Life and Environmental Science, Charles Perkins Centre and Marie Bashir Institute, University of Sydney, Sydney, NSW, Australia
| | - Brigitte Bagnol
- Kyeema Foundation, GPO Box 3023, Brisbane, Queensland, 4001, Australia.,School of Life and Environmental Science, Charles Perkins Centre and Marie Bashir Institute, University of Sydney, Sydney, NSW, Australia.,Department of Anthropology, Witwatersrand University, Johannesburg, South Africa
| | - Augustino Kibaya
- State Veterinary Services, Dodoma Rural District Council, Dodoma, Tanzania
| | - Delia Grace
- International Livestock Research Institute, PO Box 30709, Nairobi, 00100, Kenya
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13
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Complete Genome Sequence of Heat-Resistant Newcastle Disease Virus Strain HR09. GENOME ANNOUNCEMENTS 2017; 5:5/44/e01149-17. [PMID: 29097455 PMCID: PMC5668531 DOI: 10.1128/genomea.01149-17] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In this study, the complete genome sequence of the heat-resistant Newcastle disease virus (NDV) strain HR09, which was isolated in China in the 1990s, was determined and characterized phylogenetically. This is the first report regarding the complete genomic information of a thermostable NDV strain from China.
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14
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RETRACTED ARTICLE: Emergence of new sub-genotypes of Newcastle disease virus in Pakistan. WORLD POULTRY SCI J 2017. [DOI: 10.1017/s0043933917000411] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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Siddique F, Mahmood M, Hussain I, Deeba F. Evaluation of efficacy of Vero cell-adapted, thermostable Newcastle disease vaccine in broilers. J APPL POULTRY RES 2017. [DOI: 10.3382/japr/pfw055] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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