scholarly journals Lumpy skin disease in Kazakhstan

2021 ◽  
Vol 53 (1) ◽  
Author(s):  
Mukhit B. Orynbayev ◽  
Raikhan K. Nissanova ◽  
Berik M. Khairullin ◽  
Arman Issimov ◽  
Kunsulu D. Zakarya ◽  
...  
Keyword(s):  
Disease Virus ◽  
Cell Cultures ◽  
Skin Disease ◽  
Stomoxys Calcitrans ◽  
Lumpy Skin Disease ◽  
Dermacentor Marginatus ◽  
The Third ◽  
Gpcr Gene ◽  
Mdbk Cells ◽  
The Republic

AbstractThis study describes the registration of the first cases of lumpy skin disease in July 2016 in the Republic of Kazakhstan. In the rural district of Makash, Kurmangazinsky district of Atyrau region, 459 cattle fell ill and 34 died (morbidity 12.9% and mortality 0.96%). To determine the cause of the disease, samples were taken from sick and dead animals, as well as from insects and ticks. LSDV DNA was detected by PCR in all samples from dead animals and ticks (Dermacentor marginatus and Hyalomma asiaticum), in 14.29% of samples from horseflies (Tabanus bromius), and in one of the samples from two Stomoxys calcitrans flies. The reproductive LSD virus was isolated from organs of dead cattle and insects in the culture of LT and MDBK cells. The virus accumulated in cell cultures of LT and MDBK at the level of the third passage with titers in the range of 5.5–5.75 log 10 TCID50/cm3. Sequencing of the GPCR gene allowed us to identify this virus as a lumpy skin disease virus.

scholarly journals Genomic characterization of a lumpy skin disease virus isolated in southeast China

2021 ◽  
Author(s):  
Jun Ma ◽  
Yaoxian Yuan ◽  
Jianwei Shao ◽  
Minghui Sun ◽  
Weinan Huang ◽  
...  
Keyword(s):  
Disease Virus ◽  
Skin Disease ◽  
Vaccine Recombinant ◽  
Lumpy Skin Disease ◽  
Southeast China ◽  
Lumpy Skin Disease Virus ◽  
Mdbk Cells ◽  
Genomic Characterization ◽  
The One ◽  
And Control

SUMMARYLumpy skin disease virus (LSDV) is of high economic importance and has spread rapidly to many European and Asian countries in recent years. LSDVs spread to China in 2019 and have caused severe outbreaks in multiple provinces. The LSDVs in China have not been well investigated. Here we isolated an LSDV (GD01/2020) in southeast China and investigated its features in replication, phylogenetics, and genomics. GD01/2020 caused a typical LSD outbreak and replicated well in MDBK cells as detected by a novel quantitative real-time PCR assay targeting the viral GPCR gene. GD01/2020 was similar in phylogenetics to the one circulating in Xinjiang, China in 2019, and distinct from the LSDVs identified in other countries. In genomics, GD01/2020 was a vaccine-recombinant similar to those identified in Russia. A total of 13 major putative recombination events between a vaccine strain and a field strain were identified in the genome of GD01/2020, which could affect the virulence and transmissibility of the virus. The results suggested that the LSD outbreaks in China caused by a virulent vaccine-recombinant LSDV from the same unknown exotic source, and virulent vaccine-recombinant LSDVs obtained transboundary transmissibility. This report shed novel insights into the diagnosis, transmission, and control of the disease.

scholarly journals Molecular detection and phylogenetic analysis of Lumpy skin disease virus from outbreaks in Uganda 2017-2018

2019 ◽  
Author(s):  
Sylvester Ochwo ◽  
Kimberly Vanderwaal ◽  
Christian Ndekezi ◽  
Joseph Nkamwesiga ◽  
Anna Munsey ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
Disease Virus ◽  
Skin Disease ◽  
Phylogenetic Trees ◽  
African Countries ◽  
Economic Implications ◽  
Lumpy Skin Disease ◽  
Lumpy Skin Disease Virus ◽  
Gpcr Gene ◽  
The Government

Abstract Background Lumpy skin disease (LSD) is an infectious viral disease of cattle caused by a capripox virus. LSD has substantial economic implications, with infection resulting in permanent damage to the skin of affected animals which lowers their commercial value. In Uganda, LSD is endemic and cases of the disease are frequently reported to government authorities. This study was undertaken to molecularly characterize lumpy skin disease virus (LSDV) strains that have been circulating in Uganda between 2017 and 2018. Secondly, the study aimed to determine the phylogenetic relatedness of Ugandan LSDV sequences with published sequences, available in GenBank.Results A total of 7 blood samples and 16 skin nodule biopsies were screened for LSDV using PCR to confirm presence of LSDV nucleic acid. PCR positive samples were then characterised by amplifying the GPCR gene. These amplified genes were sequenced and phylogenetic trees were constructed. Out of the 23 samples analysed, 15 were positive for LSDV by PCR (65.2%). The LSDV GPCR sequences analysed contained the unique signatures of LSDV (A11, T12, T34, S99, and P199) which further confirmed their identity. Sequence comparison with vaccine strains revealed a 12bp deletion unique to Ugandan outbreak strains. Phylogenetic analysis indicated that the LSDV sequences from this study clustered closely with sequences from neighboring East African countries and with LSDV strains from recent outbreaks in Europe. It was noted that the sequence diversity amongst LSDV strains from Africa was higher than diversity from Eurasia.Conclusion The LSDV strains circulating in Uganda were closely related with sequences from neighboring countries. Comparison of GPCR gene showed that vaccine strains were not responsible for outbreaks. This means that vaccination with the currently used vaccine will probably be effective for the control of LSD in Uganda. This information is necessary to understand LSDV molecular epidemiology and to contribute knowledge towards the development of more appropriate control strategies by the Government of Uganda.

scholarly journals Molecular detection and phylogenetic analysis of Lumpy skin disease virus from outbreaks in Uganda 2017-2018

2020 ◽  
Author(s):  
Sylvester Ochwo ◽  
Kimberly VanderWaal ◽  
Christian Ndekezi ◽  
Joseph Nkamwesiga ◽  
Anna Munsey ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
Disease Virus ◽  
Skin Disease ◽  
Phylogenetic Trees ◽  
African Countries ◽  
Economic Implications ◽  
Lumpy Skin Disease ◽  
Lumpy Skin Disease Virus ◽  
Gpcr Gene ◽  
The Government

Abstract Background: Lumpy skin disease (LSD) is an infectious viral disease of cattle caused by a Capripox virus. LSD has substantial economic implications, with infection resulting in permanent damage to the skin of affected animals which lowers their commercial value. In Uganda, LSD is endemic and cases of the disease are frequently reported to government authorities. This study was undertaken to molecularly characterize lumpy skin disease virus (LSDV) strains that have been circulating in Uganda between 2017 and 2018. Secondly, the study aimed to determine the phylogenetic relatedness of Ugandan LSDV sequences with published sequences, available in GenBank. Results: A total of 7 blood samples and 16 skin nodule biopsies were screened for LSDV using PCR to confirm presence of LSDV nucleic acids. PCR positive samples were then characterized by amplifying the GPCR gene. These amplified genes were sequenced and phylogenetic trees were constructed. Out of the 23 samples analyzed, 15 were positive for LSDV by PCR (65.2%). The LSDV GPCR sequences analyzed contained the unique signatures of LSDV (A11, T12, T34, S99, and P199) which further confirmed their identity. Sequence comparison with vaccine strains revealed a 12bp deletion unique to Ugandan outbreak strains. Phylogenetic analysis indicated that the LSDV sequences from this study clustered closely with sequences from neighboring East African countries and with LSDV strains from recent outbreaks in Europe. It was noted that the sequence diversity amongst LSDV strains from Africa was higher than diversity from Eurasia. Conclusion: The LSDV strains circulating in Uganda were closely related with sequences from neighboring African countries and from Eurasia. Comparison of the GPCR gene showed that outbreak strains differed from vaccine strains. This information is necessary to understand LSDV molecular epidemiology and to contribute knowledge towards the development of control strategies by the Government of Uganda.

scholarly journals Potential mechanical transmission of Lumpy skin disease virus (LSDV) by the stable fly (Stomoxys calcitrans) through regurgitation and defecation

2021 ◽  
Vol 1 ◽  
pp. 100007
Author(s):  
Anca I. Paslaru ◽  
Niels O. Verhulst ◽  
Lena M. Maurer ◽  
Alexsandra Brendle ◽  
Nicole Pauli ◽  
...  
Keyword(s):  
Disease Virus ◽  
Skin Disease ◽  
Stomoxys Calcitrans ◽  
Mechanical Transmission ◽  
Stable Fly ◽  
Lumpy Skin Disease ◽  
Lumpy Skin Disease Virus

scholarly journals Quantifying and Modeling the Acquisition and Retention of Lumpy Skin Disease Virus by Hematophagus Insects Reveals Clinically but Not Subclinically Affected Cattle Are Promoters of Viral Transmission and Key Targets for Control of Disease Outbreaks

2021 ◽  
Vol 95 (9) ◽  
Author(s):  
Beatriz Sanz-Bernardo ◽  
Ismar R. Haga ◽  
Najith Wijesiriwardana ◽  
Sanjay Basu ◽  
Will Larner ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Disease Virus ◽  
Skin Disease ◽  
Reproduction Number ◽  
Stomoxys Calcitrans ◽  
Effective Control ◽  
Vector Species ◽  
Lumpy Skin Disease ◽  
Lumpy Skin Disease Virus ◽  
Content Type

ABSTRACT Lumpy skin disease virus (LSDV) is a vector-transmitted poxvirus that causes disease in cattle. Vector species involved in LSDV transmission and their ability to acquire and transmit the virus are poorly characterized. Using a highly representative bovine experimental model of lumpy skin disease, we fed four model vector species (Aedes aegypti, Culex quinquefasciatus, Stomoxys calcitrans, and Culicoides nubeculosus) on LSDV-inoculated cattle in order to examine their acquisition and retention of LSDV. Subclinical disease was a more common outcome than clinical disease in the inoculated cattle. Importantly, the probability of vectors acquiring LSDV from a subclinical animal (0.006) was very low compared with that from a clinical animal (0.23), meaning an insect feeding on a subclinical animal was 97% less likely to acquire LSDV than one feeding on a clinical animal. All four potential vector species studied acquired LSDV from the host at a similar rate, but Aedes aegypti and Stomoxys calcitrans retained the virus for a longer time, up to 8 days. There was no evidence of virus replication in the vector, consistent with mechanical rather than biological transmission. The parameters obtained in this study were combined with data from studies of LSDV transmission and vector life history parameters to determine the basic reproduction number of LSDV in cattle mediated by each of the model species. This reproduction number was highest for Stomoxys calcitrans (19.1), followed by C. nubeculosus (7.1) and Ae. aegypti (2.4), indicating that these three species are potentially efficient transmitters of LSDV; this information can be used to inform LSD control programs. IMPORTANCE Lumpy skin disease virus (LSDV) causes a severe systemic disease characterized by cutaneous nodules in cattle. LSDV is a rapidly emerging pathogen, having spread since 2012 into Europe and Russia and across Asia. The vector-borne nature of LSDV transmission is believed to have promoted this rapid geographic spread of the virus; however, a lack of quantitative evidence about LSDV transmission has hampered effective control of the disease during the current epidemic. Our research shows subclinical cattle play little part in virus transmission relative to clinical cattle and reveals a low probability of virus acquisition by insects at the preclinical stage. We have also calculated the reproductive number of different insect species, therefore identifying efficient transmitters of LSDV. This information is of utmost importance, as it will help to define epidemiological control measures during LSDV epidemics and of particular consequence in resource-poor regions where LSD vaccination may be less than adequate.

scholarly journals Advancements in the Growth and Construction of Recombinant Lumpy Skin Disease Virus (LSDV) for Use as a Vaccine Vector

Vaccines ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1131
Author(s):  
Michiel van Diepen ◽  
Rosamund Chapman ◽  
Nicola Douglass ◽  
Leah Whittle ◽  
Nicole Chineka ◽  
...  
Keyword(s):  
Disease Virus ◽  
Skin Disease ◽  
Vaccine Development ◽  
Good Manufacturing Practice ◽  
Rabbit Kidney ◽  
Selection Marker ◽  
Lumpy Skin Disease ◽  
Lumpy Skin Disease Virus ◽  
Diarrhea Virus ◽  
Mdbk Cells

Attenuated vaccine strains of lumpy skin disease virus (LSDV) have become increasingly popular as recombinant vaccine vectors, to target both LSDV, as well as other pathogens, including human infectious agents. Historically, these vaccine strains and recombinants were generated in primary (lamb) testis (LT) cells, Madin–Darby bovine kidney (MDBK) cells or in eggs. Growth in eggs is a laborious process, the use of primary cells has the potential to introduce pathogens and MDBK cells are known to harbor bovine viral diarrhea virus (BVDV). In this study, data is presented to show the growth of an attenuated LSDV strain in baby hamster kidney (BHK-21) cells. Subsequently, a recombinant LSDV vaccine was generated in BHK-21 cells. Partial growth was also observed in rabbit kidney cells (RK13), but only when the vaccinia virus host range gene K1L was expressed. Despite the limited growth, the expression of K1L was enough to serve as a positive selection marker for the generation of recombinant LSDV vaccines in RK13 cells. The simplification of generating (recombinant) LSDV vaccines shown here should increase the interest for this platform for future livestock vaccine development and, with BHK-21 cells approved for current good manufacturing practice, this can be expanded to human vaccines as well.

scholarly journals Quantifying and modelling the acquisition and retention of lumpy skin disease virus by haematophagus insects reveals clinically but not subclinically-affected cattle are promoters of viral transmission and key targets for control of disease outbreaks

2020 ◽  
Author(s):  
Beatriz Sanz-Bernardo ◽  
Ismar R. Haga ◽  
Najith Wijesiriwardana ◽  
Sanjay Basu ◽  
Will Larner ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Disease Virus ◽  
Skin Disease ◽  
Control Measures ◽  
Stomoxys Calcitrans ◽  
Effective Control ◽  
Vector Species ◽  
Lumpy Skin Disease ◽  
Lumpy Skin Disease Virus

AbstractLumpy skin disease virus (LSDV), a poxvirus that causes severe disease in cattle, has in the last few years rapidly extended its distribution from Africa and the Middle East into Europe, Russia, and across Asia. LSDV is believed to be primarily spread mechanically by blood-feeding arthropods, however the exact mode of arthropod transmission, the relative ability of different arthropod species to acquire and retain the virus, as well as their comparative importance for LSDV transmission, remain poorly characterised. Since the vector-borne nature of LSDV transmission is believed to have enabled the rapid geographic expansion of this virus, the lack of quantitative evidence on LSDV transmission has impeded effective control of the disease during the current epidemic. Obtaining high quality data on virus transmission by arthropods is challenging, and practical limitations often result in inadequate arthropod numbers or model hosts, limiting the transferability of experimental findings to the natural transmission scenario.We have addressed these limitations in this study. Using a highly representative bovine experimental model of lumpy skin disease we allowed four representative vector species (Aedes aegypti, Culex quinquefasciatus, Stomoxys calcitrans and Culicoides nubeculosus) to blood-feed on LSDV-inoculated cattle in order to examine the acquisition and retention of LSDV by these species in unprecedented detail. We found the probability of LSDV transmission from clinical cattle to vector correlated with disease severity. Subclinical disease was more common than clinical disease in the inoculated cattle, however the probability of vectors acquiring LSDV from subclinical animals was very low.All four potential vector species studied had a similar rate of acquisition of LSDV after feeding on the host, but Aedes aegypti and Stomoxys calcitrans retained the virus for a longer time, up to 8 days. There was no evidence of virus replication in the vector, consistent with mechanical rather than biological transmission. The parameters obtained in the in-vivo transmission experiments subsequently enabled enhanced modelling approaches to determine the basic reproduction number of LSDV in cattle mediated by each of the insect species. This was highest for Stomoxys calcitrans (19.1), C. nubeculosus (7.4), and Ae. aegypti (2.4), surprisingly indicating these three species are all potentially efficient transmitters of LSDV. These results reveal that currently applied LSDV control measures such as stamping out of all cattle on affected premises or insect control measures targeting single species need to be urgently reconsidered. Overall our studies have highlighted that the combination of highly relevant in-vivo experiments and mathematical modelling can be directly applied to devise evidence-based proportionate and targeted control programmes.

scholarly journals Retention of lumpy skin disease virus in Stomoxys spp (Stomoxys calcitrans, Stomoxys sitiens, Stomoxys indica) following intrathoracic inoculation, Diptera: Muscidae

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0238210
Author(s):  
Arman Issimov ◽  
David B. Taylor ◽  
Malik Shalmenov ◽  
Birzhan Nurgaliyev ◽  
Izimgali Zhubantayev ◽  
...  
Keyword(s):  
Disease Virus ◽  
Skin Disease ◽  
Virus Isolation ◽  
Emerging Disease ◽  
Stomoxys Calcitrans ◽  
Post Inoculation ◽  
Lumpy Skin Disease ◽  
Lumpy Skin Disease Virus ◽  
Means Of Transmission ◽  
Intrathoracic Inoculation

Lumpy skin disease (LSD) is an emerging disease of cattle in Kazakhstan and the means of transmission remains uncertain. In the current study, retention of Lumpy Skin Disease Virus (LSDV) by three Stomoxys species following intrathoracic inoculation was demonstrated under laboratory conditions. A virulent LSDV strain was injected into the thorax of flies to bypass the midgut barrier. The fate of the pathogen in the hemolymph of the flies was examined using PCR and virus isolation tests. LSDV was isolated from all three Stomoxys species up to 24h post inoculation while virus DNA was detectable up to 7d post inoculation.

scholarly journals Molecular detection and phylogenetic analysis of Lumpy skin disease virus from outbreaks in Uganda 2017-2018

2020 ◽  
Author(s):  
Sylvester Ochwo ◽  
Kimberly VanderWaal ◽  
Christian Ndekezi ◽  
Joseph Nkamwesiga ◽  
Anna Munsey ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
Disease Virus ◽  
Skin Disease ◽  
Phylogenetic Trees ◽  
African Countries ◽  
Economic Implications ◽  
Lumpy Skin Disease ◽  
Lumpy Skin Disease Virus ◽  
Gpcr Gene ◽  
The Government

Abstract Background Lumpy skin disease (LSD) is an infectious viral disease of cattle caused by a capripox virus. LSD has substantial economic implications, with infection resulting in permanent damage to the skin of affected animals which lowers their commercial value. In Uganda, LSD is endemic and cases of the disease are frequently reported to government authorities. This study was undertaken to molecularly characterize lumpy skin disease virus (LSDV) strains that have been circulating in Uganda between 2017 and 2018. Secondly, the study aimed to determine the phylogenetic relatedness of Ugandan LSDV sequences with published sequences, available in GenBank.Results A total of 7 blood samples and 16 skin nodule biopsies were screened for LSDV using PCR to confirm presence of LSDV nucleic acid. PCR positive samples were then characterised by amplifying the GPCR gene. These amplified genes were sequenced and phylogenetic trees were constructed. Out of the 23 samples analysed, 15 were positive for LSDV by PCR (65.2%). The LSDV GPCR sequences analysed contained the unique signatures of LSDV (A11, T12, T34, S99, and P199) which further confirmed their identity. Sequence comparison with vaccine strains revealed a 12bp deletion unique to Ugandan outbreak strains. Phylogenetic analysis indicated that the LSDV sequences from this study clustered closely with sequences from neighboring East African countries and with LSDV strains from recent outbreaks in Europe. It was noted that the sequence diversity amongst LSDV strains from Africa was higher than diversity from Eurasia.Conclusion The LSDV strains circulating in Uganda were closely related with sequences from neighboring countries. Comparison of GPCR gene showed that vaccine strains were not responsible for outbreaks. This means that vaccination with the currently used vaccine will probably be effective for the control of LSD in Uganda. This information is necessary to understand LSDV molecular epidemiology and to contribute knowledge towards the development of more appropriate control strategies by the Government of Uganda.

scholarly journals Influence of the Viral Superoxide Dismutase (SOD) Homologue on Lumpy Skin Disease Virus (LSDV) Growth, Histopathology and Pathogenicity

Vaccines ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 664
Author(s):  
Nicola Douglass ◽  
Henry Munyanduki ◽  
Ruzaiq Omar ◽  
Sophette Gers ◽  
Paidamwoyo Mutowembwa ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
Disease Virus ◽  
Skin Disease ◽  
Virus Growth ◽  
Lumpy Skin Disease ◽  
Lumpy Skin Disease Virus ◽  
Knock Out ◽  
Mdbk Cells

Lumpy skin disease is an important economic disease of cattle that is controlled by vaccination. This paper presents an investigation into the role of the lumpy skin disease virus (LSDV) superoxide dismutase (SOD) homologue on growth and histopathology of the virus both in vitro and in vivo. SOD homologue knock-out and knock-in recombinants (nLSDV∆SOD-UCT and nLSDVSODis-UCT, respectively) were constructed and compared to the Neethling vaccine (nLSDV) for growth in a permissive bovine cell line as well as on fertilized chick chorioallantoic membranes (CAMs). The infected CAMs were scored for histological changes. Deletion of the SOD homologue from LSDV reduced virus growth both in Madin-Darby bovine kidney (MDBK) cells as well as on CAMs. Furthermore, the knockout virus showed reduced inflammation in CAMs and more ballooning degeneration. A pilot experiment was performed in cattle to compare the lesions produced by the different LSDV constructs in the same animal. One animal developed a larger lesion to nLSDV∆SOD-UCT compared to both nLSDVSODis-UCT and nLSDV. Histological analysis of biopsies of these lesions shows less inflammation and necrosis associated with nLSDVSODis-UCT compared to nLSDV and nLSDV∆SOD-UCT. None of the vaccinated animals showed disseminated LSDV disease, indicating that the candidate vaccines are safe for further testing. Our results suggest that the SOD homologue may improve immunogenicity and reduce virulence.

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