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Yang Q, Ji J, Yang J, Zhang Y, Yin H, Dai H, Wang W, Li S. Diversity of genotypes and pathogenicity of H9N2 avian influenza virus derived from wild bird and domestic poultry. Front Microbiol 2024; 15:1402235. [PMID: 38974026 PMCID: PMC11225357 DOI: 10.3389/fmicb.2024.1402235] [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: 03/17/2024] [Accepted: 06/03/2024] [Indexed: 07/09/2024] Open
Abstract
Introduction The H9N2 subtype is a predominant avian influenza virus (AIV) circulating in Chinese poultry, forming various genotypes (A-W) based on gene segment origins. This study aims to investigate the genotypic distribution and pathogenic characteristics of H9N2 isolates from wild birds and domestic poultry in Yunnan Province, China. Methods Eleven H9N2 strains were isolated from fecal samples of overwintering wild birds and proximate domestic poultry in Yunnan, including four from common cranes (Grus grus), two from bar-headed geese (Anser indicus), and five from domestic poultry (Gallus gallus). Phylogenetic analysis was conducted to determine the genotypes, and representative strains were inoculated into Yunnan mallard ducks to assess pathogenicity. Results Phylogenetic analysis revealed that five isolates from domestic birds and one from a bar-headed goose belong to genotype S, while the remaining five isolates from wild birds belong to genotype A. These bird-derived strains possess deletions in the stalk domain of NA protein and the N166D mutation of HA protein, typical of poultry strains. Genotype S H9N2 demonstrated oropharyngeal shedding, while genotype A H9N2 exhibited cloacal shedding and high viral loads in the duodenum. Both strains caused significant pathological injuries, with genotype S inducing more severe damage to the thymus and spleen, while genotype A caused duodenal muscle layer rupture. Discussion These findings suggest that at least two genotypes of H9N2 are currently circulating in Yunnan, and Yunnan mallard ducks potentially act as intermediaries in interspecies transmission. These insights highlight the importance of analyzing the current epidemiological transmission characteristics of H9N2 among wild and domestic birds in China.
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Affiliation(s)
- Qinhong Yang
- College of Life Sciences, Southwest Forestry University, Kunming, China
| | - Jia Ji
- College of Life Sciences, Southwest Forestry University, Kunming, China
| | - Jia Yang
- College of Life Sciences, Southwest Forestry University, Kunming, China
| | - Yongxian Zhang
- Animal Disease Inspection and Supervision Institution of Yunnan Province, Kunming, China
| | - Hongbin Yin
- Animal Disease Inspection and Supervision Institution of Yunnan Province, Kunming, China
| | - Hongyang Dai
- The Management Bureau of Huize Black Necked Crane National Nature Reserve, Qujing, China
| | - Wei Wang
- College of Life Sciences, Southwest Forestry University, Kunming, China
| | - Suhua Li
- College of Life Sciences, Southwest Forestry University, Kunming, China
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Dixit B, Murugkar HV, Nagarajan S, Tosh C, Kumar M, Pathak A, Panickan S, Shrivastav N, Mishra AK, Dixit M. Prevalence and risk factor for H9N2 avian influenza virus in poultry retail shops of Madhya Pradesh. Virusdisease 2024; 35:321-328. [PMID: 39071868 PMCID: PMC11269534 DOI: 10.1007/s13337-024-00865-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2024] [Accepted: 04/22/2024] [Indexed: 07/30/2024] Open
Abstract
H9N2 avian Influenza virus subtype is highly neglected but have the potential to emerge as a next pandemic influenza virus, by either itself evolution or through the donation of genes to other subtype. So to understand the extent of H9N2 virus prevalence and associated risk factors in poultry of retail shops and their surrounding environment a cross sectional study was carried out. A total of 500 poultry tissue and 700 environmental samples were collected from 20 district of Madhya Pradesh. Virus isolation was carried out in egg inoculation and harvested allantoic fluid was tested for HA and further molecular confirmation of subtypes by RT-PCR using H9 specific primers. Prevalence was calculated and positive samples were statistically associated with observed risk factors using univariate and multivariate logistic regression analysis. A total of 9.4% and 9.7% prevalence in tissue samples and environmental samples has been reported respectively and out of 20 districts 10 (50%) were found positive for the virus. Out of 21 studied risk factors only two risk factors named as "keeping total number birds slaughtered per day" and "procuring birds from wholesaler" were found significantly associated with the H9N2 positivity in multivariate logistic regression analysis. This high level of H9N2 positivity in birds with no clinical manifestations providing a great opportunity for avian influenza virus for amplification, co-infection in other animals like dogs, cats, pigs and in human through genetic re-assortment that may lead to emergence of a novel influenza virus with high zoonotic potential. Supplementary Information The online version contains supplementary material available at 10.1007/s13337-024-00865-y.
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Affiliation(s)
- Baleshwari Dixit
- Department of Veterinary Public Health and Epidemiology, College of Veterinary Science & A. H., Kuthulia, Rewa, M.P. 486001 India
| | - H. V. Murugkar
- National High Security Animal Disease Laboratory, Bhopal, M.P. India
| | - S. Nagarajan
- National High Security Animal Disease Laboratory, Bhopal, M.P. India
| | - C. Tosh
- National High Security Animal Disease Laboratory, Bhopal, M.P. India
| | - Manoj Kumar
- National High Security Animal Disease Laboratory, Bhopal, M.P. India
| | - Anubha Pathak
- ICAR-National Research Centre on Equines, Hisar, India
| | | | - Neeraj Shrivastav
- Department of Veterinary Microbiology, College of Veterinary Science & A. H., Rewa, M.P. India
| | - Anjani K. Mishra
- Department of Livestock Production and Management, College of Veterinary Science & A. H., Rewa, M.P. India
| | - Manu Dixit
- Department Animal Husbandry and Dairying Department, Rewa, M.P. India
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Islam A, Islam S, Islam M, Hossain ME, Munro S, Samad MA, Rahman MK, Shirin T, Flora MS, Hassan MM, Rahman MZ, Epstein JH. Prevalence and risk factors for avian influenza virus (H5 and H9) contamination in peri-urban and rural live bird markets in Bangladesh. Front Public Health 2023; 11:1148994. [PMID: 37151580 PMCID: PMC10158979 DOI: 10.3389/fpubh.2023.1148994] [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: 03/27/2023] [Indexed: 05/09/2023] Open
Abstract
Avian influenza viruses (AIV) have been frequently detected in live bird markets (LBMs) around the world, primarily in urban areas, and have the ability to spillover to other species, including humans. Despite frequent detection of AIV in urban LBMs, the contamination of AIV on environmental surfaces in rural and peri-urban LBMs in Bangladesh is poorly documented. Therefore, we conducted this study to determine the prevalence of AIV subtypes within a subset of peri-urban and rural LBMs in Bangladesh and to further identify associated risk factors. Between 2017 and 2018, we collected faecal and offal samples from 200 stalls in 63 LBMs across four sub-districts. We tested the samples for the AIV matrix gene (M-gene) followed by H5, H7, and H9 subtypes using real-time reverse transcriptase-polymerase chain reaction (rRT-PCR). We performed a descriptive analysis of market cleanliness and sanitation practices in order to further elucidate the relationship between LBM biosecurity and AIV subtypes by species, sample types, and landscape. Subsequently, we conducted a univariate analysis and a generalized linear mixed model (GLMM) to determine the risk factors associated with AIV contamination at individual stalls within LBMs. Our findings indicate that practices related to hygiene and the circulation of AIV significantly differed between rural and peri-urban live bird markets. 42.5% (95% CI: 35.56-49.67) of stalls were positive for AIV. A/H5, A/H9, and A HA/Untyped were detected in 10.5% (95% CI: 6.62-15.60), 9% (95% CI: 5.42-13.85), and 24.0% (95% CI: 18.26-30.53) of stalls respectively, with no detection of A/H7. Significantly higher levels of AIV were found in the Sonali chicken strain compared to the exotic broiler, and in offal samples compared to fecal samples. In the GLMM analysis, we identified several significant risk factors associated with AIV contamination in LBMs at the stall level. These include: landscape (AOR: 3.02; 95% CI: 1.18-7.72), the number of chicken breeds present (AOR: 2.4; 95% CI: 1.01-5.67), source of birds (AOR: 2.35; 95% CI: 1.0-5.53), separation of sick birds (AOR: 3.04; 95% CI: 1.34-6.92), disposal of waste/dead birds (AOR: 3.16; 95% CI: 1.41-7.05), cleaning agent (AOR: 5.99; 95% CI: 2.26-15.82), access of dogs (AOR: 2.52; 95% CI: 1.12-5.7), wild birds observed on site (AOR: 2.31; 95% CI: 1.01-5.3). The study further revealed a substantial prevalence of AIV with H5 and H9 subtypes in peri-urban and rural LBMs. The inadequate biosecurity measures at poultry stalls in Bangladesh increase the risk of AIV transmission from poultry to humans. To prevent the spread of AIV to humans and wild birds, we suggest implementing regular surveillance at live bird markets and enhancing biosecurity practices in peri-urban and rural areas in Bangladesh.
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Affiliation(s)
- Ariful Islam
- EcoHealth Alliance, New York, NY, United States
- Centre for Integrative Ecology, School of Life and Environmental Science, Deakin University, Geelong Waurn Ponds, VIC, Australia
- *Correspondence: Ariful Islam,
| | - Shariful Islam
- Institute of Epidemiology, Disease Control and Research (IEDCR), Dhaka, Bangladesh
| | - Monjurul Islam
- Institute of Epidemiology, Disease Control and Research (IEDCR), Dhaka, Bangladesh
| | - Mohammad Enayet Hossain
- One Health Laboratory, International Centre for Diarrheal Diseases Research, Bangladesh (icddr,b), Dhaka, Bangladesh
| | - Sarah Munro
- EcoHealth Alliance, New York, NY, United States
| | - Mohammed Abdus Samad
- National Reference Laboratory for Avian Influenza, Bangladesh Livestock Research Institute (BLRI), Savar, Bangladesh
| | - Md. Kaisar Rahman
- Institute of Epidemiology, Disease Control and Research (IEDCR), Dhaka, Bangladesh
| | - Tahmina Shirin
- Institute of Epidemiology, Disease Control and Research (IEDCR), Dhaka, Bangladesh
| | | | - Mohammad Mahmudul Hassan
- Queensland Alliance for One Health Sciences, School of Veterinary Science, University of Queensland, Brisbane, QLD, Australia
| | - Mohammed Ziaur Rahman
- One Health Laboratory, International Centre for Diarrheal Diseases Research, Bangladesh (icddr,b), Dhaka, Bangladesh
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Rehman S, Effendi MH, Shehzad A, Rahman A, Rahmahani J, Witaningrum AM, Bilal M. Prevalence and associated risk factors of avian influenza A virus subtypes H5N1 and H9N2 in LBMs of East Java province, Indonesia: a cross-sectional study. PeerJ 2022. [DOI: 10.7717/peerj.14095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Background
Avian influenza A virus subtypes H5N1 and H9N2 are contagious zoonotic diseases that are circulating in Indonesia and have raised increasing concern about their potential impacts on poultry and public health. A cross-sectional study was carried out to investigate the prevalence and associated risk factors of avian influenza A virus subtypes H5N1 and H9N2 among poultry in the live bird markets of four cities in East Java province, Indonesia.
Methods
A total of 600 tracheal and cloacal swabs (267 from backyards, 179 from broilers, and 154 from layers) from healthy birds were collected. The samples were inoculated into specific pathogenic-free embryonated eggs at 9-day-old via the allantoic cavity. qRT-PCR was used for further identification of avian influenza.
Results
The overall prevalence of circulating influenza A virus subtypes H5N1 and H9N2 was 3.8% (23/600, 95%CI [0.0229–0.0537]). Prevalence was higher in backyards at 5.99% (16/267) followed by broilers (2.23% (4/179)) and layers (1.68% (3/154)). The final multivariable model revealed five risk factors for H9N2 infections: presence of ducks (p = 0.003, OR = 38.2), turkeys (p = 0.017 OR = 0.032), and pheasants in the stall (p = 0.04, OR = 18.422), dry (p = 0.006) and rainy season (p < 0.001), and household birds (p = 0.002) and seven factors for H5N1 infections including: observing rodents (p = 0.036, OR = 0.005), stray dogs access (p = 0.004 OR ≤ 0.001), presence of turkeys (p = 0.03 OR = 0.007), chukars/partridges (p = 0.024 OR = 2500), and peafowls in the stalls (p = 0.0043 OR ≤ 0.001), rainy season (p = 0.001) and birds from the household sources (p = 0.002) in the live bird markets.
Conclusions
The findings of the current study illustrate the recurring infection and presence of both avian influenza viruses and associated risk factors in the surveyed marketplaces. Effective protective measures and mitigation strategies for risks outlined in this study could help to reduce the burden of H5N1 and H9N2 AI subtypes into the live bird markets of Indonesia.
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Affiliation(s)
- Saifur Rehman
- Division of Veterinary Public Health, Faculty of Veterinary Medicine, Airlangga University, Surabaya, East Java, Indonesia
- Laboratory of Virology and Immunology Division of Microbiology, Faculty of Veterinary Medicine, Airlangga University, Surabaya, East Java, Indonesia
- Department of Epidemiology and Public Health, Faculty of Veterinary Science, University of Veterinary and Animal Sciences, Lahore, Punjab, Pakistan
| | - Mustofa Helmi Effendi
- Division of Veterinary Public Health, Faculty of Veterinary Medicine, Airlangga University, Surabaya, East Java, Indonesia
| | - Aamir Shehzad
- Laboratory of Virology and Immunology Division of Microbiology, Faculty of Veterinary Medicine, Airlangga University, Surabaya, East Java, Indonesia
| | - Attaur Rahman
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, SAR
| | - Jola Rahmahani
- Laboratory of Virology and Immunology Division of Microbiology, Faculty of Veterinary Medicine, Airlangga University, Surabaya, East Java, Indonesia
| | - Adiana Mutamsari Witaningrum
- Division of Veterinary Public Health, Faculty of Veterinary Medicine, Airlangga University, Surabaya, East Java, Indonesia
| | - Muhammad Bilal
- Department of Epidemiology and Public Health, Faculty of Veterinary Science, University of Veterinary and Animal Sciences, Lahore, Punjab, Pakistan
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Awais M, Wajid A, Goraichuk IV, Batool A, Rahim A, Anif A, Ahmed N, Yin R. Surveillance and Assessment of Risk Factors for Newcastle Disease Virus from Live Bird Retail Stalls in Lahore District of Pakistan. Avian Dis 2022; 66:1-8. [PMID: 36017908 DOI: 10.1637/aviandiseases-d-22-00010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 05/24/2022] [Indexed: 12/14/2022]
Abstract
Live bird markets (LBMs) in Asian countries are considered hubs for the spread of several poultry viruses. In Pakistan, there is a lack of uniformity in practices used in LBMs, which leads to the spread of poultry diseases. A cross-sectional survey was conducted in June-October 2017 to determine the circulation of Newcastle disease virus (NDV) in chickens being sold in live bird retail stalls (LBRSs) and to identify potential risk factors associated with estimated prevalence. A total of 189 stalls (n = 1134 birds) distributed in eight administrative towns of Lahore were visited. A pool of six oropharyngeal swabs was collected from each stall and tested by real-time reverse transcriptase PCR for the presence of NDV. Forty-two out of 189 swabs were found positive with an overall prevalence of 22.22% (95% confidence interval [Cl]: 16.88%-28.67%). Data for 11 potential risk factors acquired through questionnaires were analyzed by survey-weighted logistic regression and prevalence odds ratios (ORs) for associated risk factors were calculated. A final multivariable model identified three risk factors for NDV prevalence in LBRSs, including trading other poultry breeds alongside broilers (OR = 2.41; 95% confidence interval [CI] = 1.5-6.1), purchasing birds from mixed sources (OR = 3.12; 95% CI = 1.4-11.9), and number of birds sold per day (OR = 6.32; 95% CI = 1.9-23.5). Additionally, 24 selected samples were sequenced and phylogenetic analysis of the complete fusion gene (1662 bp) revealed that all isolates belonged to Subgenotype VII.2. This study provides important information on the epidemiology of NDV in Pakistan and highlights the importance of implementing surveillance and biosecurity practices in LBRSs.
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Affiliation(s)
- Muhammad Awais
- Department of Biotechnology, Virtual University of Pakistan, Lahore, Pakistan
| | - Abdul Wajid
- Department of Biotechnology, Virtual University of Pakistan, Lahore, Pakistan, , .,Department of Biotechnology, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, Pakistan
| | - Iryna V Goraichuk
- National Scientific Center, Institute of Experimental and Clinical Veterinary Medicine, Kharkiv, Ukraine
| | - Andleeb Batool
- Department of Zoology, Government College University, Lahore, Pakistan
| | - Asif Rahim
- Department of Microbiology, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, Pakistan
| | - Atif Anif
- Department of Botany and Microbiology, King Saud University, Riyadh, Saudi Arabia
| | - Nazeer Ahmed
- Department of Biotechnology, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, Pakistan
| | - Renfu Yin
- Department of Veterinary Preventive Medicine, College of Veterinary Medicine, Jilin University, Changchun, Xi'an, Jilin, China
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Prevalence and diversity of Trichomonas gallinae in meat pigeons (Columba livia) in Guangdong Province, People's Republic of China. Parasitol Res 2022; 121:3183-3191. [PMID: 36083410 DOI: 10.1007/s00436-022-07640-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Accepted: 08/23/2022] [Indexed: 10/14/2022]
Abstract
Pigeon farming for meat has developed into an important economic industry in most countries, especially in China. Trichomoniasis, caused by the protozoan parasite Trichomonas gallinae, is a worldwide disease in pigeons. However, studies of the prevalence and distribution of T. gallinae lineages in domestic pigeons in southern China are limited. In this study, a total of 636 pigeon throat swabs samples from four regions in Guangdong Province were screened for T. gallinae by in vitro culture assays and microscopy. The results revealed an overall prevalence of T. gallinae infection in southern China of 26.6% (169/636). There were significant differences in the infection rate of T. gallinae between the four regions (χ2 = 117.948, df = 4, P = 0.000), with up to 44.6% in the Pearl River Delta region. The infection rate of young pigeons was as high as 70.8%. The rDNA sequences (18S rRNA/ITS1-5.8S rRNA-ITS2) of 153 positive samples were amplified and sequenced. Results identified 58.2% (89/153) overall as ITS-A (18S-VI) (also known as ITS-OBT-Tg-1) and 41.8% (64/153) as ITS-B (18S-IV) (also known as ITS-OBT-Tg-2). Thus, ITS-A (18S-VI) was the dominant T. gallinae genotype in southern China, especially in young pigeon (97.0%, 32/33). In conclusion, a high prevalence of T. gallinae infection in domestic pigeons was identified in southern China, particularly in the Pearl River Delta region. The ITS-A (18S-VI) was the dominant genotype highly pathogenic, which may weaken the immune system of pigeons, and cause a negative impact on the development of the pigeon industry in China.
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Ahmad S, Koh KY, Yoo DS, Lee JI. Impact of inland waters on highly pathogenic avian influenza outbreaks in neighboring poultry farms in South Korea. J Vet Sci 2022; 23:e36. [PMID: 35618317 PMCID: PMC9149499 DOI: 10.4142/jvs.21278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 01/11/2022] [Accepted: 01/20/2022] [Indexed: 11/20/2022] Open
Abstract
Background Since 2003, the H5 highly pathogenic avian influenza (HPAI) subtype has caused massive economic losses in the poultry industry in South Korea. The role of inland water bodies in avian influenza (AI) outbreaks has not been investigated. Identifying water bodies that facilitate risk pathways leading to the incursion of the HPAI virus (HPAIV) into poultry farms is essential for implementing specific precautionary measures to prevent viral transmission. Objectives This matched case-control study (1:4) examined whether inland waters were associated with a higher risk of AI outbreaks in the neighboring poultry farms. Methods Rivers, irrigation canals, lakes, and ponds were considered inland water bodies. The cases and controls were chosen based on the matching criteria. The nearest possible farms located within a radius of 3 km of the case farms were chosen as the control farms. The poultry farms were selected randomly, and two HPAI epidemics (H5N8 [2014–2016] and H5N6 [2016–2017]) were studied. Conditional logistic regression analysis was applied. Results Statistical analysis revealed that inland waters near poultry farms were significant risk factors for AI outbreaks. The study speculated that freely wandering wild waterfowl and small animals contaminate areas surrounding poultry farms. Conclusions Pet birds and animals raised alongside poultry birds on farm premises may wander easily to nearby waters, potentially increasing the risk of AI infection in poultry farms. Mechanical transmission of the AI virus occurs when poultry farm workers or visitors come into contact with infected water bodies or their surroundings. To prevent AI outbreaks in the future, poultry farms should adopt strict precautions to avoid contact with nearby water bodies and their surroundings.
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Affiliation(s)
- Saleem Ahmad
- Veterinary Public Health Lab, College of Veterinary Medicine, Chonnam National University, Gwangju 61216, Korea
| | - Kye-Young Koh
- Veterinary Public Health Lab, College of Veterinary Medicine, Chonnam National University, Gwangju 61216, Korea
| | - Dae-Sung Yoo
- Animal and Plant Quarantine Agency, Gimcheon 39660, Korea
| | - Jae-Il Lee
- Veterinary Public Health Lab, College of Veterinary Medicine, Chonnam National University, Gwangju 61216, Korea
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Xiao Y, Yang F, Liu F, Yao H, Wu N, Wu H. Antigen-capture ELISA and immunochromatographic test strip to detect the H9N2 subtype avian influenza virus rapidly based on monoclonal antibodies. Virol J 2021; 18:198. [PMID: 34600550 PMCID: PMC8487345 DOI: 10.1186/s12985-021-01671-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 09/23/2021] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND The H9N2 subtype of avian influenza virus (AIV) has become the most widespread subtype of AIV among birds in Asia, which threatens the poultry industry and human health. Therefore, it is important to establish methods for the rapid diagnosis and continuous surveillance of H9N2 subtype AIV. METHODS In this study, an antigen-capture enzyme-linked immunosorbent assay (AC-ELISA) and a colloidal gold immunochromatographic test (ICT) strip using monoclonal antibodies (MAbs) 3G4 and 2G7 were established to detect H9N2 subtype AIV. RESULTS The AC-ELISA method and ICT strip can detect H9N2 subtype AIV quickly, and do not cross-react with other subtype AIVs or other viruses. The detection limit of AC-ELISA was a hemagglutinin (HA) titer of 4 for H9N2 subtype AIV per 100 μl sample, and the limit of detection of the HA protein of AIV H9N2 was 31.5 ng/ml. The ICT strip detection limit was an HA titer of 4 for H9N2 subtype AIV per 100 μl sample. Moreover, both detection methods exhibited good reproducibility and repeatability, with coefficients of variation < 5%. For detection in 200 actual poultry samples, the sensitivities and specificities of AC-ELISA were determined as 93.2% and 98.1%, respectively. The sensitivities and specificities of the ICT strips were determined as 90.9% and 97.4%, respectively. CONCLUSIONS The developed AC-ELISA and ICT strips displayed high specificity, sensitivity, and stability, making them suitable for rapid diagnosis and field investigation of H9N2 subtype AIV.
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Affiliation(s)
- Yixin Xiao
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China
| | - Fan Yang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China
| | - Fumin Liu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China
| | - Hangping Yao
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China
| | - Nanping Wu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China
| | - Haibo Wu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China.
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Chaudhry M, Rashid HB, Thrusfield M, Eisler MC, Welburn SC. Serosurvey of Avian Influenza Viruses (H5, H7, and H9) and Associated Risk Factors in Backyard Poultry Flocks of Lahore District, Pakistan. Front Vet Sci 2021; 8:631164. [PMID: 33842573 PMCID: PMC8024624 DOI: 10.3389/fvets.2021.631164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Accepted: 02/08/2021] [Indexed: 12/13/2022] Open
Abstract
Rural poultry constitutes 56% of the total poultry population in Pakistan; however, epidemiological information about avian influenza viruses (AIVs) in backyard poultry flocks is lacking. A cross-sectional survey of villages of Lahore district was conducted from July 2009 to August 2009 using two-stage cluster sampling and probability proportional to size (PPS) sampling to estimate seroprevalence and its associated risk factors. A random selection of 35 clusters from 308 villages of Lahore were considered, and from each cluster, six chickens aged >2 months were selected. A total of 210 serum samples were collected and examined by the hemagglutination inhibition (HI) test for specific antibodies against AIV subtypes H5, H7, and H9. Overall weighted seroprevalence for AIVs was 65.2% (95% CI: 55.6–74.8%), and for subtype H5, H7 & H9 was 6.9% (95% CI: 10.8–23.0%), 0% (95% CI: 0–1.7%), and 62.0% (95% CI: 52.2–71.8%) respectively. However, none of the samples were positive for H7. The average flock size was 17.3 birds, and the main purpose of keeping poultry was for eggs/meat (70.6%, 95% CI: 59.7–81.4). A majority of them were reared in a semi-caged system (83%, 95% CI: 74.5–91.3). Backyard birds were received from different sources, that is, purchased from the market or received as a gift from friends or any NGO, and were 5.7 times more likely to become avian influenza (AI) seropositive than those that were not exposed to these sources (CI 95%: 2.0–716.0). Backyard birds which were received from different sources, that is, purchased from the market or received from friends or any NGO, were 5.7 times more likely to become AI seropositive compared to those that were not (CI 95%: 2.5–18.7). To reduce the risk of AIV in Pakistan, continuous surveillance of backyard poultry would be needed.
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Affiliation(s)
- Mamoona Chaudhry
- Infection Medicine, Deanery of Biomedical Sciences, Edinburgh Medical School, College of Medicine & Veterinary Medicine, The University of Edinburgh, Edinburgh, United Kingdom.,Deptarment of Epidemiology and Public Health, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Hamad Bin Rashid
- Deptarment of Surgery and Pet Sciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Michael Thrusfield
- Royal (Dick) School of Veterinary Studies, College of Medicine and Veterinary Medicine, University of Edinburgh-Easter Bush Campus, Roslin, United Kingdom
| | - Mark C Eisler
- Bristol Veterinary School, University of Bristol, Bristol, United Kingdom
| | - Susan C Welburn
- Infection Medicine, Deanery of Biomedical Sciences, Edinburgh Medical School, College of Medicine & Veterinary Medicine, The University of Edinburgh, Edinburgh, United Kingdom.,Zhejiang University-University of Edinburgh Institute, Zhejiang University School of Medicine, Zhejiang University, Haining, China
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Alyas K, Wajid A, Dundon WG, Ather S, Batool T, Babar ME. Isolation and Characterization of Avian Influenza H9N2 Viruses from Different Avian Species in Pakistan 2016-17. Avian Dis 2020; 63:721-726. [PMID: 31865688 DOI: 10.1637/aviandiseases-d-19-00070] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 06/27/2019] [Indexed: 11/05/2022]
Abstract
Avian influenza (AI) virus (AIV) subtype H9N2 continues to cause significant outbreaks among commercial and backyard poultry in Pakistan. Despite this, the characterization of H9N2 viruses in avian hosts other than chickens in Pakistan has not been thoroughly investigated. In this study, 12 low pathogenicity avian influenza viruses subtype H9N2 were isolated from peacocks (n = 4), ducks (n = 4), pheasants (n = 2), geese (n = 1), and black swans (n = 1) in Pakistan during 2016 and were characterized on the basis of the hemagglutinin (HA) and neuraminidase genes. All of the viruses possessed an amino acid substitution Q226L in the receptor-binding site of the HA protein, which is known to contribute to increased viral replication and virulence in mammals. In addition, phylogenetic studies showed that these H9N2 AIVs belonged to the Middle East B genetic group of sublineage G1 and were very similar to viruses isolated from an outbreak in chickens in Pakistan in 2017. This demonstrates an epidemiologic link between poultry and other avian species, which is a fact to consider in future H9N2 disease management programs.
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Affiliation(s)
- Kashaf Alyas
- Department of Biotechnology, Virtual University of Pakistan, 1-Davis Road, Lahore, Pakistan 54000.,The first two authors contributed equally to this work.,A. W. and K. A. conceived and designed the experiments. K. A., S. A., and T. B. performed the experiments. A. W., W. G. D., and M. E. B. analyzed the data. A. W. and W. G. D. wrote the paper that was approved by all authors
| | - Abdul Wajid
- Department of Biotechnology, Virtual University of Pakistan, 1-Davis Road, Lahore, Pakistan 54000, ; .,The first two authors contributed equally to this work.,A. W. and K. A. conceived and designed the experiments. K. A., S. A., and T. B. performed the experiments. A. W., W. G. D., and M. E. B. analyzed the data. A. W. and W. G. D. wrote the paper that was approved by all authors
| | - William G Dundon
- Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Vienna International Centre, Vienna, Austria 2444.,A. W. and K. A. conceived and designed the experiments. K. A., S. A., and T. B. performed the experiments. A. W., W. G. D., and M. E. B. analyzed the data. A. W. and W. G. D. wrote the paper that was approved by all authors
| | - Safa Ather
- Department of Molecular Biology, Virtual University of Pakistan, 1-Davis Road Lahore, Pakistan 54000.,A. W. and K. A. conceived and designed the experiments. K. A., S. A., and T. B. performed the experiments. A. W., W. G. D., and M. E. B. analyzed the data. A. W. and W. G. D. wrote the paper that was approved by all authors
| | - Tayyeba Batool
- Department of Molecular Biology, Virtual University of Pakistan, 1-Davis Road Lahore, Pakistan 54000.,A. W. and K. A. conceived and designed the experiments. K. A., S. A., and T. B. performed the experiments. A. W., W. G. D., and M. E. B. analyzed the data. A. W. and W. G. D. wrote the paper that was approved by all authors
| | - Masroor Ellahi Babar
- Department of Molecular Biology, Virtual University of Pakistan, 1-Davis Road Lahore, Pakistan 54000.,A. W. and K. A. conceived and designed the experiments. K. A., S. A., and T. B. performed the experiments. A. W., W. G. D., and M. E. B. analyzed the data. A. W. and W. G. D. wrote the paper that was approved by all authors
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A Global Perspective on H9N2 Avian Influenza Virus. Viruses 2019; 11:v11070620. [PMID: 31284485 PMCID: PMC6669617 DOI: 10.3390/v11070620] [Citation(s) in RCA: 158] [Impact Index Per Article: 31.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 06/30/2019] [Accepted: 07/01/2019] [Indexed: 11/26/2022] Open
Abstract
H9N2 avian influenza viruses have become globally widespread in poultry over the last two decades and represent a genuine threat both to the global poultry industry but also humans through their high rates of zoonotic infection and pandemic potential. H9N2 viruses are generally hyperendemic in affected countries and have been found in poultry in many new regions in recent years. In this review, we examine the current global spread of H9N2 avian influenza viruses as well as their host range, tropism, transmission routes and the risk posed by these viruses to human health.
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