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Newcastle Disease and Avian Influenza H9N2 Outbreaks in Backyard Chickens, Iran, 2014-2015 Texto completo
2021
Fallah Mehrabadi, Mohammad Hossein | Motamed, Najmeh | Ghalyanchilangeroudi, Arash | Ghafouri, Seyed Ali | Tehrani, Farshad
BACKGROUND: Backyard poultry are at risk of exposure to various viral contagious diseases such as Newcastle (ND) and Avian Influenza (AI). These diseases, in addition to the backyard poultry infection have an influence on villagers’ livelihoods. Also, backyard poultry plays an important role in circulation and survival of these viruses in environment and are considered as a risk factor for the poultry industry. OBJECTIVES: Studying the prevalence level of ND and Influenza H9N2 diseases in backyard chickens in Iran, in 2014-2015. METHODS: A descriptive cross-sectional study was conducted for two years (2014-2015) in backyard chickens with mortalities suspected of infection with ND or AI H9N2 viruses. Each mortality report was considered as one outbreak. For detection of possible ND or influenza virus infection tracheal and lung tissue samples were investigated by RT-PCR reaction test. Results were analyzed statistically by SPSS software. RESULTS: Overall, 121 outbreaks of Newcastle or influenza (H9N2) disease with 25.936 cases of death from 17 provinces were reported in two years. of these, 54 outbreaks (44/6 %) were caused by H9N2 influenza virus, 58 (47/9 %) by velogenic ND virus and 9 (7/4 %) outbreaks were caused by influenza and Newcastle concurrent infection. Hotspot ratio in 2015 was significantly higher than in 2014. In comparison with Newcastle disease alone or concurrent ND and influenza outbreaks, the highest mean mortality rate was observed in H9N2 outbreaks. Outbreaks were reported in all seasons but the rate of occurrence in the months of June and July was significantly higher than the rest of the year. CONCLUSIONS: According to our results ND and H9N2 influenza virus infections are widely distributed in backyard chickens of villages in Iran. So, for implementation of control strategies, education of villagers, vaccination and annual surveillance of backyard poultry seem necessary.
Mostrar más [+] Menos [-]Surveillance of the rabies-related lyssavirus, Mokola in non-volant small mammals in South Africa Texto completo
2021
McMahon,William C. | Coertse,Jessica | Kearney,Teresa | Keith,Mark | Swanepoel,Lourens H. | Markotter,Wanda
Surveillance of the rabies-related lyssavirus, Mokola in non-volant small mammals in South Africa Texto completo
2021
McMahon,William C. | Coertse,Jessica | Kearney,Teresa | Keith,Mark | Swanepoel,Lourens H. | Markotter,Wanda
The reservoir host of Mokola virus (MOKV), a rabies-related lyssavirus species endemic to Africa, remains unknown. Only sporadic cases of MOKV have been reported since its first discovery in the late 1960s, which subsequently gave rise to various reservoir host hypotheses. One particular hypothesis focusing on non-volant small mammals (e.g. shrews, sengis and rodents) is buttressed by previous MOKV isolations from shrews (Crocidura sp.) and a single rodent (Lophuromys sikapusi). Although these cases were only once-off detections, it provided evidence of the first known lyssavirus species has an association with non-volant small mammals. To investigate further, retrospective surveillance was conducted in 575 small mammals collected from South Africa. Nucleic acid surveillance using a pan-lyssavirus quantitative real-time reverse transcription polymerase chain reaction (qRT-PCR) assay of 329 brain samples did not detect any lyssavirus ribonucleic acid (RNA). Serological surveillance using a micro-neutralisation test of 246 serum samples identified 36 serum samples that were positive for the presence of MOKV neutralising antibodies (VNAs). These serum samples were all collected from Gerbilliscus leucogaster (Bushveld gerbils) rodents from Meletse in Limpopo province (South Africa). Mokola virus infections in Limpopo province have never been reported before, and the high MOKV seropositivity of 87.80% in these gerbils may indicate a potential rodent reservoir.
Mostrar más [+] Menos [-]Surveillance of the rabies-related lyssavirus, Mokola in non-volant small mammals in South Africa Texto completo
2021
William C. McMahon | Jessica Coertse | Teresa Kearney | Mark Keith | Lourens H. Swanepoel | Wanda Markotter
The reservoir host of Mokola virus (MOKV), a rabies-related lyssavirus species endemic to Africa, remains unknown. Only sporadic cases of MOKV have been reported since its first discovery in the late 1960s, which subsequently gave rise to various reservoir host hypotheses. One particular hypothesis focusing on non-volant small mammals (e.g. shrews, sengis and rodents) is buttressed by previous MOKV isolations from shrews (Crocidura sp.) and a single rodent (Lophuromys sikapusi). Although these cases were only once-off detections, it provided evidence of the first known lyssavirus species has an association with non-volant small mammals. To investigate further, retrospective surveillance was conducted in 575 small mammals collected from South Africa. Nucleic acid surveillance using a pan-lyssavirus quantitative real-time reverse transcription polymerase chain reaction (qRT-PCR) assay of 329 brain samples did not detect any lyssavirus ribonucleic acid (RNA). Serological surveillance using a micro-neutralisation test of 246 serum samples identified 36 serum samples that were positive for the presence of MOKV neutralising antibodies (VNAs). These serum samples were all collected from Gerbilliscus leucogaster (Bushveld gerbils) rodents from Meletse in Limpopo province (South Africa). Mokola virus infections in Limpopo province have never been reported before, and the high MOKV seropositivity of 87.80% in these gerbils may indicate a potential rodent reservoir.
Mostrar más [+] Menos [-]SARS-CoV-2 monitoring on mink farms in Poland Texto completo
2022
Domańska-Blicharz Katarzyna | Orłowska Anna | Smreczak Marcin | Munnink Bas Oude | Trębas Paweł | Socha Wojciech | Niemczuk Krzysztof | Kawiak-Sadurska Magdalena | Opolska Justyna | Lisowska Anna | Giza Aleksandra | Bomba Arkadiusz | Iwan Ewelina | Koopmans Marion | Rola Jerzy
Many countries have reported severe acute respiratory syndrome-coronavirus 2 (SARS-CoV-2) infections in mink, and transmission back to humans has raised the concern of novel variants emerging in these animals. The monitoring system on Polish mink farms detected SARS-CoV-2 infection first in January 2021 and has been kept in place since then.
Mostrar más [+] Menos [-]PCR based prevalence study of Francisella tularensis in Kharkiv, Dnipropetrovsk, and Mykolaiv oblasts during 2015–2018 Texto completo
2020
Zlenko Oksana Borysivna | Tkach Gennadiy Evgenievich | Sukhorukova Anna Borysivna | Kylypko Lyudmila Vitaliivna | Machota Lubov Stepanivna | Ignatenkov Oleksandr Stefanovych | Vinokurova Kateryna Volodymyrivna | Shamychkova Galyna Rostyslavivna | Shtepa Oleksandr Pymonovych | Rezvykh Valentyna Gennadievna | Schwarz Julia | Duerr Angela | Popp Claudia | Buttlar Heiner von | Wolfel Roman | Solodiankin Oleksii Sergiiovych | Gerilovych Anton Pavlovych
PCR based prevalence study of Francisella tularensis in Kharkiv, Dnipropetrovsk, and Mykolaiv oblasts during 2015–2018 Texto completo
2020
Zlenko Oksana Borysivna | Tkach Gennadiy Evgenievich | Sukhorukova Anna Borysivna | Kylypko Lyudmila Vitaliivna | Machota Lubov Stepanivna | Ignatenkov Oleksandr Stefanovych | Vinokurova Kateryna Volodymyrivna | Shamychkova Galyna Rostyslavivna | Shtepa Oleksandr Pymonovych | Rezvykh Valentyna Gennadievna | Schwarz Julia | Duerr Angela | Popp Claudia | Buttlar Heiner von | Wolfel Roman | Solodiankin Oleksii Sergiiovych | Gerilovych Anton Pavlovych
Tularaemia is a zoonotic disease caused by the gram-negative bacterium Francisella tularensis, which is endemic to Ukraine. The aim of this work was to provide screening of different field samples (rodent tails, ticks, pellets, water, and hay) to obtain an actual picture of the tularaemia epizootic situation in the Kharkiv, Dnipropetrovsk, and Mykolaiv oblasts.
Mostrar más [+] Menos [-]PCR based prevalence study of Francisella tularensis in Kharkiv, Dnipropetrovsk, and Mykolaiv oblasts during 2015–2018 Texto completo
2020
Zlenko, Oksana Borysivna | Tkach, Gennadiy Evgenievich | Sukhorukova, Anna Borysivna | Kylypko, Lyudmila Vitaliivna | Machota, Lubov Stepanivna | Ignatenkov, Oleksandr Stefanovych | Vinokurova, Kateryna Volodymyrivna | Shamychkova, Galyna Rostyslavivna | Shtepa, Oleksandr Pymonovych | Rezvykh, Valentyna Gennadievna | Schwarz, Julia | Duerr, Angela | Popp, Claudia | Buttlar, Heiner von | Wolfel, Roman | Solodiankin, Oleksii Sergiiovych | Gerilovych, Anton Pavlovych
Tularaemia is a zoonotic disease caused by the gram-negative bacterium Francisella tularensis, which is endemic to Ukraine. The aim of this work was to provide screening of different field samples (rodent tails, ticks, pellets, water, and hay) to obtain an actual picture of the tularaemia epizootic situation in the Kharkiv, Dnipropetrovsk, and Mykolaiv oblasts. Samples were collected using the flag method (for ticks) and break-back traps (for rodents). Also, hay, water and owl pellets were collected for study. The F. tularensis genetic material in samples was detected using a 16S qPCR. It was found that in Kharkiv oblast, 23% of collected samples were positive for F. tularensis, in Dnipropetrovsk oblast 1.9%, and in Mykolaiv oblast 0.4%. Among the sample types, 34.7% of ticks, 1.8% of rodents, and 36.4% of pellets were positive for F. tularensis. The most frequent carriers of F. tularensis were the D. reticulatus and I. ricinus ticks (74.2% and 29.3%, respectively, of positive results).
Mostrar más [+] Menos [-]Dispensable role of wild rodents in avian influenza A virus transmission in Gyeonggi province, Korea Texto completo
2024
Lee, C.Y. | Kim, I.H. | Kwon, H.J.
Avian influenza A viruses (IAVs) present significant threats to both animal and human health through their potential for cross-species transmission and global spread. Clade 2.3.4.4 H5Nx highly pathogenic avian IAVs initially emerged in East Asia between 2013 and 2014. Since then, they have spread to Europe, Africa, and America via migratory bird flyways. However, beyond viral transmission primarily facilitated by migratory birds, the potential involvement of other intermediate factors for virus transmission remains poorly investigated. This study aimed to investigate the role of wild rodents as intermediary hosts in the ecology of avian IAVs in Gyeonggi province, South Korea. By capturing and analyzing 189 wild rodents near poultry farms and migratory bird habitats in 2013 and 2014 and employing serological assays and virus isolation techniques, we found no evidence of IAV infection among these populations. Our results suggest that wild rodents may not significantly contribute to the transmission dynamics of IAVs within these regions.
Mostrar más [+] Menos [-]Survey of the knowledge, attitude and perceptions on bovine tuberculosis in Mnisi community, Mpumalanga, South Africa Texto completo
2020
Marange, Rudo(University of Pretoria Faculty of Veterinary Science Department of Veterinary Tropical Diseases) | Morar-Leather, Darshana(University of Pretoria Faculty of Veterinary Science Department of Veterinary Tropical Diseases) | Fasina, Folorunso O.(University of Pretoria Faculty of Veterinary Science Department of Veterinary Tropical Diseases,Food and Agriculture Organization of the United Nations)
Survey of the knowledge, attitude and perceptions on bovine tuberculosis in Mnisi community, Mpumalanga, South Africa Texto completo
2020
Marange, Rudo(University of Pretoria Faculty of Veterinary Science Department of Veterinary Tropical Diseases) | Morar-Leather, Darshana(University of Pretoria Faculty of Veterinary Science Department of Veterinary Tropical Diseases) | Fasina, Folorunso O.(University of Pretoria Faculty of Veterinary Science Department of Veterinary Tropical Diseases,Food and Agriculture Organization of the United Nations)
Tuberculosis (TB) is a global health concern of zoonotic importance, and Mycobacterium bovis and Mycobacterium tuberculosis are the most common causes of TB in animals and humans, respectively. Integral to TB control strategies are the communities affected by this epidemic. Tuberculosis awareness by the community is an effective TB control strategy as education empowers people to make informed choices with regard to mitigating TB risk factors in their daily lives. We conducted a knowledge, attitude and perceptions survey in Mnisi pastoral community in South Africa using a semi-structured questionnaire to evaluate the level of bovine TB (bTB) awareness, and provided informed feedback to the community on the outcome of the study. Although participants were aware of TB, the knowledge of the zoonotic potential of bTB and about susceptible hosts was limited. The study findings showed knowledge gaps regarding common risk factors, including coughing while herding cattle, unsupervised/uninspected communal slaughter and improper disposal of infected meat. In contrast, it was noted that the majority of participants discarded meat with visible lesions and consumed pasteurised milk; thus, the risk of TB transmission via the ingestion route is low. Tuberculosis knowledge gaps were evident in the community, and public health and veterinary authorities need to improve relationships with stakeholders and implement awareness programmes that use a one health approach.
Mostrar más [+] Menos [-]Survey of the knowledge, attitude and perceptions on bovine tuberculosis in Mnisi community, Mpumalanga, South Africa Texto completo
2020
Rudo Marange | Darshana Morar-Leather | Folorunso O. Fasina
Tuberculosis (TB) is a global health concern of zoonotic importance, and Mycobacterium bovis and Mycobacterium tuberculosis are the most common causes of TB in animals and humans, respectively. Integral to TB control strategies are the communities affected by this epidemic. Tuberculosis awareness by the community is an effective TB control strategy as education empowers people to make informed choices with regard to mitigating TB risk factors in their daily lives. We conducted a knowledge, attitude and perceptions survey in Mnisi pastoral community in South Africa using a semi-structured questionnaire to evaluate the level of bovine TB (bTB) awareness, and provided informed feedback to the community on the outcome of the study. Although participants were aware of TB, the knowledge of the zoonotic potential of bTB and about susceptible hosts was limited. The study findings showed knowledge gaps regarding common risk factors, including coughing while herding cattle, unsupervised/uninspected communal slaughter and improper disposal of infected meat. In contrast, it was noted that the majority of participants discarded meat with visible lesions and consumed pasteurised milk; thus, the risk of TB transmission via the ingestion route is low. Tuberculosis knowledge gaps were evident in the community, and public health and veterinary authorities need to improve relationships with stakeholders and implement awareness programmes that use a one health approach.
Mostrar más [+] Menos [-]Improvement of indirect enzyme-linked immunosorbent assay for detection of Japanese encephalitis virus antibodies in swine sera
2017
Yang, D.K., Viral Disease Division,Animal and Plant Quarantine Agency, Gimcheon, Republic of Korea | Kim, H.H., Viral Disease Division,Animal and Plant Quarantine Agency, Gimcheon, Republic of Korea | Jo, H.Y., Viral Disease Division,Animal and Plant Quarantine Agency, Gimcheon, Republic of Korea | Lee, S.H., Viral Disease Division,Animal and Plant Quarantine Agency, Gimcheon, Republic of Korea | Jang, S.H., R and D Center, MEDIAN Diagnostics, Chuncheon, Republic of Korea | Lee, S.O., R and D Center, MEDIAN Diagnostics, Chuncheon, Republic of Korea | Choi, S.S., Viral Disease Division,Animal and Plant Quarantine Agency, Gimcheon, Republic of Korea | Cho, I.S., Viral Disease Division,Animal and Plant Quarantine Agency, Gimcheon, Republic of Korea
Japanese encephalitis (JE) is an important zoonosis caused by the mosquito-transmitted JE virus (JEV), which is a causative agent of reproductive failure in pregnant sows. Detection of JEV antibodies in swine is performed by hemagglutination inhibition (HI), virus neutralization (VN), and the plaque reduction neutralization test (PRNT). The most stringent PRNT is the 90% endpoint PRNT (PRNT∧90). These conventional assays are difficult to carry out in diagnostic laboratories with insufficient instruments or cell culture systems. An alternative assay that is easily conducted and time efficient is required. In this study, we improved the indirect enzyme-linked immunosorbent assay (I-ELISA) with clarified antigen for the detection of JEV antibodies. The I-ELISA results obtained from 175 swine serum samples were compared with HI, VN, and PRNT∧90 results. The sensitivity of I-ELISA was 91.8%, 95.0%, and 94.7% compared with HI, VN, and PRNT∧90 results, respectively. The specificity of I-ELISA was 92.2%, 94.7%, and 94.7% compared with HI, VN, and PRNT∧90 results, respectively. Moreover, the I-ELISA results were significantly correlated with the HI (r = 0.93), VN (r = 0.95), and PRN∧T90 (r = 0.92) results. These results suggest that the improved I-ELISA is useful for serosurveillance of JEV in swine.
Mostrar más [+] Menos [-]Spatiotemporal analysis of African swine fever in wild boar in Serbia from 2020 to 2024 Texto completo
2025
Dimitrije Glišić | Sofija Šolaja | Ljubisa Veljović | Jelena Maksimović-Zorić | Vesna Milićević
African swine fever (ASF) is a highly fatal viral haemorrhagic disease affecting pigs. This study uses official surveillance data to investigate the persistence and spread of ASF in wild boar populations in Serbia from 2020 to 2024. A total of 480 ASF cases were analysed, with spatiotemporal clustering conducted via SaTScan™ and proximity analyses performed in the Quantum Geographic Information System. The yearly prevalence of ASF in wild boar rose steadily from 0.66% in 2020 to 1.47% in 2023. Seasonal trends showed a significant increase in cases during winter (68%) and spring (24%). Five distinct clusters were identified, predominantly near the borders with North Macedonia and Bulgaria, suggesting potential cross-border transmission. Proximity to major roads was significantly associated with ASF case distribution (p 0.01), while proximity to water bodies and elevation showed no consistent pattern. The findings highlight critical gaps in current passive surveillance systems, which likely underestimate ASF prevalence. The study underscores the need for enhanced surveillance in remote and wooded areas and proposes strategies to improve ASF monitoring and control in wild boar populations. Contribution: This study highlights the feasibility of cost-effective, non-invasive surveillance methods for ASF detection, offering critical insights for low-income countries where resources for intensive disease monitoring are limited. By demonstrating how environmental and anthropogenic factors drive ASF dynamics, this research provides actionable strategies for improving regional and global ASF control efforts.
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