Viruses

Research

20 pages, 4803 KiB

Open AccessArticle

Genomic Characterization and Molecular Epidemiology of Tusaviruses and Related Novel Protoparvoviruses (Family Parvoviridae) from Ruminant Species (Bovine, Ovine and Caprine) in Hungary

by Fruzsina Tóth, Péter Pankovics, Péter Urbán, Róbert Herczeg, Ervin Albert, Gábor Reuter and Ákos Boros

Viruses 2025, 17(7), 888; https://doi.org/10.3390/v17070888 - 24 Jun 2025

Abstract

Tusavirus 1 of species Protoparvovirus incertum 1 (family Parvoviridae) was first identified in humans and later in small ruminants (caprine and ovine). This study reports the full-length coding sequences (~4400–4600 nt) of three novel tusavirus-related protoparvoviruses from ovine (“misavirus”, PV540792), for the [...] Read more.

Tusavirus 1 of species Protoparvovirus incertum 1 (family Parvoviridae) was first identified in humans and later in small ruminants (caprine and ovine). This study reports the full-length coding sequences (~4400–4600 nt) of three novel tusavirus-related protoparvoviruses from ovine (“misavirus”, PV540792), for the first time bovine (“sisavirus”, PV540793) and subsequently from caprine (“gisavirus” PV540850/51) fecal samples, using next-generation sequencing (NGS) and PCR techniques. Their NS1, VP1 and VP2 proteins shared 61–63% amino acid identities with each other and with tusaviruses, suggesting these three viruses belong to three novel species in the genus Protoparvovirus. Phylogenetic analyses placed them with tusaviruses on a separate main branch, implying a shared origin among these most likely ruminant protoparvoviruses. A small-scale epidemiological investigation on 318 ruminant enteric samples using novel generic NS1 primers found misavirus in 14/51 (27.5%) ovine and sisavirus in 19/203 (9.4%) bovine samples from multiple Hungarian farms. Tusavirus was present in 5/51 (9.8%) ovine and 15/62 (24.2%) caprine samples, all from one farm. The highest prevalences for all three viruses were found in animals aged 2–12 months, though sporadic cases were also found in other age groups. Partial NS and VP sequence-based phylogenetic trees showed virus-specific lineages for misa-, sisa-, gisa- and tusaviruses, with various strains forming sub-lineages. These findings suggest the presence of multiple genotypes and/or members of additional species, which was supported by a VP sequence-based hierarchical cluster analysis. The study’s viruses were mostly phylogenetically separated by host; however, two bovine sisavirus strains with diverse phylogenetic localizations in the NS (belonging to bovine sisaviruses) and VP1 trees (distantly related to ovine misaviruses) could indicate previous (interspecies?) recombination events. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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12 pages, 1832 KiB

Open AccessArticle

Single-Cell Analysis of Host Responses in Bovine Milk Somatic Cells (bMSCs) Following HPAIV Bovine H5N1 Influenza Exposure

by Gagandeep Singh, Sujan Kafle, Patricia Assato, Mankanwal Goraya, Igor Morozov and Juergen A. Richt

Viruses 2025, 17(6), 811; https://doi.org/10.3390/v17060811 - 3 Jun 2025

Viewed by 514

Abstract

The 2024 outbreak of highly pathogenic avian influenza virus (HPAIV) H5N1 in U.S. dairy cattle presented an unprecedented scenario where the virus infected bovine mammary glands and was detected in milk, raising serious concerns for public health and the dairy industry. Unlike previously [...] Read more.

The 2024 outbreak of highly pathogenic avian influenza virus (HPAIV) H5N1 in U.S. dairy cattle presented an unprecedented scenario where the virus infected bovine mammary glands and was detected in milk, raising serious concerns for public health and the dairy industry. Unlike previously described subclinical influenza A virus (IAV) infections in cattle, H5N1 infection induced severe clinical symptoms, including respiratory distress, mastitis, and abnormal milk production. To understand the host immune responses and changes, particularly in the mammary gland, we performed single-cell RNA sequencing analysis on bovine milk somatic cells (bMSCs) in vitro exposed to an H5N1 isolate from an infected dairy farm. We identified ten distinct cell clusters and observed a shift toward type-2 immune responses, characterized by T cells expressing IL13 and GATA3, and three different subtypes of epithelial cells based on the expression of genes associated with milk production. Our study revealed temporal dynamics in cytokine expression, with a rapid decline in luminal epithelial cells and an increase in macrophages and dendritic cells, suggesting a role in increased antigen presentation. While viral RNA was detected in bulk-exposed bMSC samples via qRT-PCR, no viral reads were observed in the scRNA-seq data, indicating that the immune responses captured may be due to exposure to viral components rather than productive infection. This research fills a critical gap in understanding the immune responses of bovine mammary glands to H5N1 exposure and highlights the need for further investigation into therapeutic strategies for managing such outbreaks. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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14 pages, 7209 KiB

Open AccessArticle

Establishment and Implementation of the Point-of-Care RT-RAA-CRISPR/Cas13a Diagnostic Test for Foot-And-Mouth Disease Virus Serotype O in Pigs

by Ping Meng, Bo Ni, Chenyu Li, Zhou Sha, Chunju Liu, Weijie Ren, Rong Wei, Fuxiao Liu, Jinming Li and Zhiliang Wang

Viruses 2025, 17(5), 721; https://doi.org/10.3390/v17050721 - 17 May 2025

Viewed by 578

Abstract

Foot and mouth disease virus (FMDV) is a highly pathogenic virus that mainly infects cloven hooved animals, such as pigs. The establishment of a rapid, sensitive and accurate point-of-care detection method is critical for the timely identification and elimination of infected pigs for [...] Read more.

Foot and mouth disease virus (FMDV) is a highly pathogenic virus that mainly infects cloven hooved animals, such as pigs. The establishment of a rapid, sensitive and accurate point-of-care detection method is critical for the timely identification and elimination of infected pigs for controlling this disease. In this study, a RT-RAA-CRISPR/Cas13a method was developed for the detection of FMDV serotype O in pigs. Six pairs of RT-RAA primers were designed based on the conserved gene sequence of FMDV serotype O, and the optimal amplification primers and reaction temperatures were screened. The CRISPR-derived RNA (crRNA) was further designed based on the optimal target band sequence and the most efficient crRNA was screened. The results revealed that FMDV-O-F4/R4 was the optimal primer set, and the optimal temperature for the RT-RAA reaction was 37 °C. Moreover, crRNA4 exhibited the strongest detection signal among the six crRNAs. The established RT-RAA-CRISPR/Cas13a method demonstrated high specificity and no cross-reactivity with other common swine pathogens such as Senecavirus A (SVA), porcine reproductive and respiratory virus (PRRSV), porcine epidemic diarrhea virus (PEDV), porcine circovirus type 2 (PCV2), classical swine fever virus (CSFV), and pseudorabies virus (PRV), additionally, it was observed to be highly sensitive, with a detection limit of 19.1 copies/µL. The repeatability of this method was also observed to be good. This method could produce stable fluorescence and exhibited good repeatability when three independent experiments yielded the same results. A validation test using three types of simulated clinical samples (including swab, tissue, and serum samples) revealed a 100% concordance rate. The detection results could be visualized via a fluorescence reader or lateral flow strips (LFSs). Thus, a highly specific and sensitive RT-RAA-CRISPR/Cas13a detection method was developed and is expected to be applied for the rapid detection of FMDV serotype O in situ. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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15 pages, 2900 KiB

Open AccessArticle

Characterization of Papillomatous Lesions and Genetic Diversity of Bovine Papillomavirus from the Amazon Region

by Fernanda dos Anjos Souza, Cíntia Daudt, André de Medeiros Costa Lins, Igor Ribeiro dos Santos, Lorena Yanet Cáceres Tomaya, Agnes de Souza Lima, Eduardo Mitke Brandão Reis, Rafael Augusto Satrapa, David Driemeier, Audrey Bagon, Cláudio Wageck Canal, Felipe Masiero Salvarani and Flavio Roberto Chaves da Silva

Viruses 2025, 17(5), 719; https://doi.org/10.3390/v17050719 - 16 May 2025

Viewed by 358

Abstract

Bovine papillomaviruses (BPVs) have been widely characterized from cutaneous warts in cattle worldwide. However, there are still limited studies addressing the geographic distribution of viral types and their potential associations with the histopathological characteristics of lesions, particularly in the vast and ecologically diverse [...] Read more.

Bovine papillomaviruses (BPVs) have been widely characterized from cutaneous warts in cattle worldwide. However, there are still limited studies addressing the geographic distribution of viral types and their potential associations with the histopathological characteristics of lesions, particularly in the vast and ecologically diverse Amazon region. This study aimed to histologically and phylogenetically characterize cutaneous papillomatous lesions in cattle from the Vale do Guaporé, located in the Brazilian Western Amazon. A total of 54 wart samples were collected from 44 cattle clinically diagnosed with cutaneous papillomatosis. Histopathological analysis classified 58.33% of cases as fibropapillomas and 39.58% as squamous papillomas. Molecular analysis, based on L1 gene amplification and sequencing, identified the presence of previously reported BPV types (BPV2, 4, 5, 12, 13, and 15), along with a novel BPV14 subtype and three putative new types (PNT). Statistical analysis revealed that BPV2 was significantly associated with fibropapillomas (p = 0.023), whereas BPV13 was linked to cauliflower-like morphological lesions (p = 0.008). These findings enhance the understanding of BPV diversity circulating in cattle from the Amazon region and provide valuable insights into the clinicopathological aspects of bovine cutaneous papillomatosis, which may aid in future epidemiological surveillance and disease control strategies. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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51 pages, 13898 KiB

Open AccessArticle

Turkey B Cell Transcriptome Profile During Turkey Hemorrhagic Enteritis Virus (THEV) Infection Highlights Upregulated Apoptosis and Breakdown Pathways That May Mediate Immunosuppression

by Abraham Quaye, Brett E. Pickett, Joel S. Griffitts, Bradford K. Berges and Brian D. Poole

Viruses 2025, 17(3), 299; https://doi.org/10.3390/v17030299 - 21 Feb 2025

Viewed by 681

Abstract

Infection with the turkey hemorrhagic enteritis virus (THEV) can cause hemorrhagic enteritis, which affects young turkeys. This disease is characterized by bloody diarrhea and immunosuppression (IMS), which is attributed to apoptosis of infected B cells. Secondary infections due to IMS exacerbate economic losses. [...] Read more.

Infection with the turkey hemorrhagic enteritis virus (THEV) can cause hemorrhagic enteritis, which affects young turkeys. This disease is characterized by bloody diarrhea and immunosuppression (IMS), which is attributed to apoptosis of infected B cells. Secondary infections due to IMS exacerbate economic losses. We performed the first transcriptomic analysis of a THEV infection to elucidate the mechanisms mediating THEV-induced IMS. After infecting and sequencing mRNAs of a turkey B-cell line, trimmed reads were mapped to the host turkey genome, and gene expression was quantified with StringTie. Differential gene expression analysis was followed by functional enrichment analyses using gprofiler2 and DAVID from NCBI. RT-qPCR of select genes was performed to validate the RNA-seq data. A total of 2343 and 3295 differentially expressed genes (DEGs) were identified at 12 hpi and 24 hpi, respectively. The DEGs correlated with multiple biological processes including apoptosis, ER unfolded protein response, and cell maintenance. Multiple pro-apoptotic genes, including APAF1, BMF, BAK1, and FAS were upregulated. Genes that play a role in ER stress-induced unfolded protein response including VCP, UFD1, EDEM1, and ATF4 were also upregulated and may contribute to apoptosis. Our data suggest that several biological processes and pathways including apoptosis and ER response to stress are important aspects of the host cell response to THEV infection. It is possible that interplay between multiple processes may mediate apoptosis of infected B-cells, leading to IMS. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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11 pages, 10993 KiB

Open AccessArticle

Novel Pestiviruses Detected in Cattle Interfere with Bovine Viral Diarrhea Virus Diagnostics

by Judith Köster, Karla Schneider, Dirk Höper, Andreas Salditt, Martin Beer, Thomas Miller and Kerstin Wernike

Viruses 2024, 16(8), 1301; https://doi.org/10.3390/v16081301 - 15 Aug 2024

Viewed by 1296

Abstract

Since the start of the mandatory nationwide bovine viral diarrhea (BVD) eradication program in Germany in 2011, the number of persistently infected (PI) animals has decreased considerably, resulting in a continuous decrease in seroprevalence. The increasingly BVD-naive cattle population could facilitate spillover infections [...] Read more.

Since the start of the mandatory nationwide bovine viral diarrhea (BVD) eradication program in Germany in 2011, the number of persistently infected (PI) animals has decreased considerably, resulting in a continuous decrease in seroprevalence. The increasingly BVD-naive cattle population could facilitate spillover infections with non-BVDV ruminant pestiviruses. Here, we report two cases in which novel pestiviruses were isolated from cattle; in both cases, the whole genome sequence showed the highest level of identity to strain “Pestivirus reindeer-1”. Both novel viruses gave positive results in BVDV diagnostic test systems, confirming that cross-reactivity is an important issue in pestivirus diagnostics. In the first case, the pestivirus was probably transmitted from sheep kept with the affected cattle, suggesting that the co-housing of small ruminants and cattle is a risk factor. The source of infection could not be determined in the second case. The occurrence of these two cases in independent cattle holdings within a relatively short time frame suggests that it would be useful to determine the presence of pestiviruses in small ruminants or even wild ruminants to better assess risk factors, especially for BVDV-free populations. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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14 pages, 7313 KiB

Open AccessArticle

Genetic Characterization of Lumpy Skin Disease Viruses Circulating in Lesotho Cattle

by Mabusetsa Joseph Raporoto Makalo, Tirumala Bharani Kumar Settypalli, Irene Kasindi Meki, Mame Thierno Bakhoum, Hatem Ouled Ahmed, Moeketsi Solomon Phalatsi, Tsepo Ramatla, ThankGod Emmanuel Onyiche, Lineo Nionzima-Bohloa, Artem Metlin, Madhur Dhingra, Giovanni Cattoli, Charles Euloge Lamien and Oriel Matlhahane Molifi Thekisoe

Viruses 2024, 16(5), 762; https://doi.org/10.3390/v16050762 - 11 May 2024

Cited by 1 | Viewed by 3422

Abstract

Lumpy skin disease is one of the fast-spreading viral diseases of cattle and buffalo that can potentially cause severe economic impact. Lesotho experienced LSD for the first time in 1947 and episodes of outbreaks occurred throughout the decades. In this study, eighteen specimens [...] Read more.

Lumpy skin disease is one of the fast-spreading viral diseases of cattle and buffalo that can potentially cause severe economic impact. Lesotho experienced LSD for the first time in 1947 and episodes of outbreaks occurred throughout the decades. In this study, eighteen specimens were collected from LSD-clinically diseased cattle between 2020 and 2022 from Mafeteng, Leribe, Maseru, Berea, and Mohales’ Hoek districts of Lesotho. A total of 11 DNA samples were analyzed by PCR and sequencing of the extracellular enveloped virus (EEV) glycoprotein, G-protein-coupled chemokine receptor (GPCR), 30 kDa RNA polymerase subunit (RPO30), and B22R genes. All nucleotide sequences of the above-mentioned genes confirmed that the PCR amplicons of clinical samples are truly LSDV, as they were identical to respective LSDV isolates on the NCBI GenBank. Two of the elevem samples were further characterized by whole-genome sequencing. The analysis, based on both CaPV marker genes and complete genome sequences, revealed that the LSDV isolates from Lesotho cluster with the NW-like LSDVs, which includes the commonly circulating LSDV field isolates from Africa, the Middle East, the Balkans, Turkey, and Eastern Europe. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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15 pages, 4318 KiB

Open AccessArticle

The Accumulation of Phenyllactic Acid Impairs Host Glutamine Metabolism and Inhibits African Swine Fever Virus Replication: A Novel Target for the Development of Anti-ASFV Drugs

by Junfei Dai, Xusheng Ma, Ashenafi Kiros Wubshet, Qian Li, Xiaofen Shang, Zhikuan Luo, Jianan Liu, Zhiyu Li, Mingxia Li, Yujie Song, Lijun Guo, Jie Zhang and Haixue Zheng

Viruses 2024, 16(3), 449; https://doi.org/10.3390/v16030449 - 13 Mar 2024

Cited by 1 | Viewed by 2397

Abstract

African swine fever (ASF) is a highly contagious and hemorrhagic disease caused by infection with the African swine fever virus (ASFV), resulting in a mortality rate of up to 100%. Currently, there are no effective treatments and commercially available vaccines for ASF. Therefore, [...] Read more.

African swine fever (ASF) is a highly contagious and hemorrhagic disease caused by infection with the African swine fever virus (ASFV), resulting in a mortality rate of up to 100%. Currently, there are no effective treatments and commercially available vaccines for ASF. Therefore, it is crucial to identify biochemicals derived from host cells that can impede ASFV replication, with the aim of preventing and controlling ASF. The ASFV is an acellular organism that promotes self-replication by hijacking the metabolic machinery and biochemical resources of host cells. ASFV specifically alters the utilization of glucose and glutamine, which are the primary metabolic sources in mammalian cells. This study aimed to investigate the impact of glucose and glutamine metabolic dynamics on the rate of ASFV replication. Our findings demonstrate that ASFV infection favors using glutamine as a metabolic fuel to facilitate self-replication. ASFV replication can be substantially inhibited by blocking glutamine metabolism. The metabolomics analysis of the host cell after late-stage ASFV infection revealed a significant disruption of normal glutamine metabolic pathways due to the abundant expression of PLA (phenyllactic acid). Pretreatment with PLA also inhibited ASFV proliferation and glutamine consumption following infection. The metabolomic analysis also showed that PLA pretreatment greatly slowed down the metabolism of amino acids and nucleotides that depend on glutamine. The depletion of these building blocks directly hindered the replication of ASFV by decreasing the biosynthetic precursors produced during the replication of ASFV’s progeny virus. These findings provide valuable insight into the possibility of pursuing the development of antiviral drugs against ASFV that selectively target metabolic pathways. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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15 pages, 2137 KiB

Open AccessArticle

Evolution of Endogenous Retroviruses in the Subfamily of Caprinae

by Ali Shoaib Moawad, Fengxu Wang, Yao Zheng, Cai Chen, Ahmed A. Saleh, Jian Hou and Chengyi Song

Viruses 2024, 16(3), 398; https://doi.org/10.3390/v16030398 - 4 Mar 2024

Cited by 5 | Viewed by 2370

Abstract

The interest in endogenous retroviruses (ERVs) has been fueled by their impact on the evolution of the host genome. In this study, we used multiple pipelines to conduct a de novo exploration and annotation of ERVs in 13 species of the Caprinae subfamily. [...] Read more.

The interest in endogenous retroviruses (ERVs) has been fueled by their impact on the evolution of the host genome. In this study, we used multiple pipelines to conduct a de novo exploration and annotation of ERVs in 13 species of the Caprinae subfamily. Through analyses of sequence identity, structural organization, and phylogeny, we defined 28 ERV groups within Caprinae, including 19 gamma retrovirus groups and 9 beta retrovirus groups. Notably, we identified four recent and potentially active groups prevalent in the Caprinae genomes. Additionally, our investigation revealed that most long noncoding genes (lncRNA) and protein-coding genes (PC) contain ERV-derived sequences. Specifically, we observed that ERV-derived sequences were present in approximately 75% of protein-coding genes and 81% of lncRNA genes in sheep. Similarly, in goats, ERV-derived sequences were found in approximately 74% of protein-coding genes and 75% of lncRNA genes. Our findings lead to the conclusion that the majority of ERVs in the Caprinae genomes can be categorized as fossils, representing remnants of past retroviral infections that have become permanently integrated into the genomes. Nevertheless, the identification of the Cap_ERV_20, Cap_ERV_21, Cap_ERV_24, and Cap_ERV_25 groups indicates the presence of relatively recent and potentially active ERVs in these genomes. These particular groups may contribute to the ongoing evolution of the Caprinae genome. The identification of putatively active ERVs in the Caprinae genomes raises the possibility of harnessing them for future genetic marker development. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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13 pages, 2263 KiB

Open AccessArticle

Immune Responses to Influenza D Virus in Calves Previously Infected with Bovine Viral Diarrhea Virus 2

by Fernando Vicosa Bauermann, Shollie Falkenberg, Jennifer M. Rudd, Cristina Mendes Peter, Ingryd Merchioratto, Jerry W. Ritchey, John Gilliam, Jared Taylor, Hao Ma and Mayara Fernanda Maggioli

Viruses 2023, 15(12), 2442; https://doi.org/10.3390/v15122442 - 16 Dec 2023

Cited by 1 | Viewed by 1694

Abstract

Bovine viral diarrhea virus (BVDV) induces immunosuppression and thymus depletion in calves. This study explores the impact of prior BVDV-2 exposure on the subsequent immune response to influenza D virus (IDV). Twenty 3-week-old calves were divided into four groups. Calves in G1 and [...] Read more.

Bovine viral diarrhea virus (BVDV) induces immunosuppression and thymus depletion in calves. This study explores the impact of prior BVDV-2 exposure on the subsequent immune response to influenza D virus (IDV). Twenty 3-week-old calves were divided into four groups. Calves in G1 and G3 were mock-treated on day 0, while calves in G2 and G4 received BVDV. Calves in G1 (mock) and G2 (BVDV) were necropsied on day 13 post-infection. IDV was inoculated on day 21 in G3 calves (mock + IDV) and G4 (BVDV + IDV) and necropsy was conducted on day 42. Pre-exposed BVDV calves exhibited prolonged and increased IDV shedding in nasal secretions. An approximate 50% reduction in the thymus was observed in acutely infected BVDV calves (G2) compared to controls (G1). On day 42, thymus depletion was observed in two calves in G4, while three had normal weight. BVDV-2-exposed calves had impaired CD8 T cell proliferation after IDV recall stimulation, and the α/β T cell impairment was particularly evident in those with persistent thymic atrophy. Conversely, no difference in antibody levels against IDV was noted. BVDV-induced thymus depletion varied from transient to persistent. Persistent thymus atrophy was correlated with weaker T cell proliferation, suggesting correlation between persistent thymus atrophy and impaired T cell immune response to subsequent infections. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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Review

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17 pages, 842 KiB

Open AccessReview

Recombinant Sendai Virus Vectors as Novel Vaccine Candidates Against Animal Viruses

by Álex Gómez and Ramsés Reina

Viruses 2025, 17(5), 737; https://doi.org/10.3390/v17050737 - 21 May 2025

Viewed by 523

Abstract

Vaccination plays a pivotal role in the control and prevention of animal infectious diseases. However, no efficient and safe universal vaccines are currently registered for major pathogens such as influenza A virus, foot-and-mouth disease virus (FMDV), simian immunodeficiency virus (SIV), and small ruminant [...] Read more.

Vaccination plays a pivotal role in the control and prevention of animal infectious diseases. However, no efficient and safe universal vaccines are currently registered for major pathogens such as influenza A virus, foot-and-mouth disease virus (FMDV), simian immunodeficiency virus (SIV), and small ruminant lentiviruses (SRLV). Here, we review the development of Sendai virus (SeV) vectors as a promising vaccine platform for animal diseases. Recombinant SeV vectors (rSeVv) possess several key features that make them highly suitable for developing vaccination strategies: (1) SeV has exclusively cytoplasmic replication cycle, therefore incapable of transforming host cells by integrating into the cellular genome, (2) rSeVv can accommodate large foreign gene/s inserts (~5 kb) with strong but adjustable transgene expression, (3) can be propagated to high titers in both embryonated chicken eggs and mammalian cell lines, (4) exhibits potent infectivity across a broad range of mammalian cells from different animals species, (5) undergo transient replication in the upper and lower respiratory tracts of non-natural hosts, (6) has not been associated with disease in pigs, non-humans primates, and small ruminants, ensuring a favorable safety profile, and (7) induce a robust innate and cellular immune responses. Preclinical and clinical studies using rSeVv-based vaccines against influenza A virus, FMDV, SIV, and SRLV have yielded promising results. Therefore, this review highlights the potential of rSeVv-based vaccine platforms as a valuable strategy for combating animal viruses. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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26 pages, 7974 KiB

Open AccessReview

Interactions Between Bovine Respiratory Syncytial Virus and Cattle: Aspects of Pathogenesis and Immunity

by Lariane da Silva Barcelos, Alexandra K. Ford, Matheus Iuri Frühauf, Nadalin Yandra Botton, Geferson Fischer and Mayara Fernanda Maggioli

Viruses 2024, 16(11), 1753; https://doi.org/10.3390/v16111753 - 8 Nov 2024

Viewed by 2475

Abstract

Bovine respiratory syncytial virus (BRSV) is a major respiratory pathogen in cattle and is relevant to the livestock industry worldwide. BRSV is most severe in young calves and is often associated with stressful management events. The disease is responsible for economic losses due [...] Read more.

Bovine respiratory syncytial virus (BRSV) is a major respiratory pathogen in cattle and is relevant to the livestock industry worldwide. BRSV is most severe in young calves and is often associated with stressful management events. The disease is responsible for economic losses due to lower productivity, morbidity, mortality, and prevention and treatment costs. As members of the same genus, bovine and human RSV share a high degree of homology and are similar in terms of their genomes, transmission, clinical signs, and epidemiology. This overlap presents an opportunity for One Health approaches and translational studies, with dual benefits; however, there is still a relative lack of studies focused on BRSV, and the continued search for improved prophylaxis highlights the need for a deeper understanding of its immunological features. BRSV employs different host-immunity-escaping mechanisms that interfere with effective long-term memory responses to current vaccines and natural infections. This review presents an updated description of BRSV’s immunity processes, such as the PRRs and signaling pathways involved in BRSV infection, aspects of its pathogeny, and the evading mechanisms developed by the virus to thwart the immune response. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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19 pages, 6373 KiB

Open AccessReview

The Current Epizootiological Situation of Three Major Viral Infections Affecting Cattle in Egypt

by Sherin R. Rouby, Ahmed H. Ghonaim, Xingxiang Chen and Wentao Li

Viruses 2024, 16(10), 1536; https://doi.org/10.3390/v16101536 - 28 Sep 2024

Cited by 2 | Viewed by 2894

Abstract

One of the major factors hindering efficient livestock production is the presence of high-impact infectious animal diseases, such as foot and mouth disease (FMD), lumpy skin disease (LSD), and bovine ephemeral fever (BEF), which are notable viral infections affecting cattle in Egypt, leading [...] Read more.

One of the major factors hindering efficient livestock production is the presence of high-impact infectious animal diseases, such as foot and mouth disease (FMD), lumpy skin disease (LSD), and bovine ephemeral fever (BEF), which are notable viral infections affecting cattle in Egypt, leading to significant economic losses. FMD is caused by the foot and mouth disease virus (FMDV) of the genus Aphthovirus in the Picornaviridae family. LSD is caused by lumpy skin disease virus (LSDV) of Capripox genus within the Poxviridae family, subfamily Chordopoxvirinae. BEF is caused by bovine ephemeral fever virus (BEFV) of genus Ephemerovirus in the Rhabdoviridae family. FMD is a highly contagious viral infection of domestic and wild cloven-hooved animals and can spread through the wind. On the other hand, LSD and BEF are arthropod-borne viral diseases that mainly affect domestic cattle and water buffalo. Despite government vaccination efforts, these three viral diseases have become widespread in Egypt, with several reported epidemics. Egypt’s importation of large numbers of animals from different countries, combined with unregulated animal movements through trading and borders between African countries and Egypt, facilitates the introduction of new FMDV serotypes and lineages not covered by the current vaccination plans. To establish an effective control program, countries need to assess the real epizootic situation of various infectious animal diseases to develop an efficient early warning system. This review provides information about FMD, LSD, and BEF, including their economic impacts, causative viruses, global burden, the situation in Egypt, and the challenges in controlling these diseases. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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18 pages, 1773 KiB

Open AccessReview

Epidemiological Dynamics of Foot-and-Mouth Disease in the Horn of Africa: The Role of Virus Diversity and Animal Movement

by Fanos Tadesse Woldemariyam, Christopher Kinyanjui Kariuki, Joseph Kamau, Annebel De Vleeschauwer, Kris De Clercq, David J. Lefebvre and Jan Paeshuyse

Viruses 2023, 15(4), 969; https://doi.org/10.3390/v15040969 - 14 Apr 2023

Cited by 14 | Viewed by 6210

Abstract

The Horn of Africa is a large area of arid and semi-arid land, holding about 10% of the global and 40% of the entire African livestock population. The region’s livestock production system is mainly extensive and pastoralist. It faces countless problems, such as [...] Read more.

The Horn of Africa is a large area of arid and semi-arid land, holding about 10% of the global and 40% of the entire African livestock population. The region’s livestock production system is mainly extensive and pastoralist. It faces countless problems, such as a shortage of pastures and watering points, poor access to veterinary services, and multiple endemic diseases like foot-and-mouth disease (FMD). Foot-and-mouth disease is one of the most economically important livestock diseases worldwide and is endemic in most developing countries. Within Africa, five of the seven serotypes of the FMD virus (FMDV) are described, but serotype C is not circulating anymore, a burden unseen anywhere in the world. The enormous genetic diversity of FMDV is favored by an error-prone RNA-dependent RNA polymerase, intra-typic and inter-typic recombination, as well as the quasi-species nature of the virus. This paper describes the epidemiological dynamics of foot-and-mouth disease in the Horn of Africa with regard to the serotypes and topotypes distribution of FMDV, the livestock production systems practiced, animal movement, the role of wildlife, and the epidemiological complexity of FMD. Within this review, outbreak investigation data and serological studies confirm the endemicity of the disease in the Horn of Africa. Multiple topotypes of FMDV are described in the literature as circulating in the region, with further evolution of virus diversity predicted. A large susceptible livestock population and the presence of wild ungulates are described as complicating the epidemiology of the disease. Further, the husbandry practices and legal and illegal trading of livestock and their products, coupled with poor biosecurity practices, are also reported to impact the spread of FMDV within and between countries in the region. The porosity of borders for pastoralist herders fuels the unregulated transboundary livestock trade. There are no systematic control strategies in the region except for sporadic vaccination with locally produced vaccines, while literature indicates that effective control measures should also consider virus diversity, livestock movements/biosecurity, transboundary trade, and the reduction of contact with wild, susceptible ungulates. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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Other

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10 pages, 576 KiB

Open AccessBrief Report

First Molecular Evidence of Equine Herpesvirus Type 1 (EHV-1) in Ocular Swabs of Clinically Affected Horses

by Beatriz Musoles-Cuenca, Miguel Padilla-Blanco, Valentina Vitale, Teresa Lorenzo-Bermejo, María de la Cuesta-Torrado, Beatriz Ballester, Elisa Maiques, Consuelo Rubio-Guerri and Ana Velloso Alvarez

Viruses 2025, 17(6), 862; https://doi.org/10.3390/v17060862 - 18 Jun 2025

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Abstract

Equine Herpesvirus Type 1 (EHV-1) is a significant pathogen within the Alphaherpesvirinae subfamily, causing respiratory disease, abortions, and, in severe cases, equine herpesvirus myeloencephalopathy (EHM). While nasal swabs and blood samples are commonly used for real-time polymerase chain reaction (RT-PCR) diagnosis, variability in [...] Read more.

Equine Herpesvirus Type 1 (EHV-1) is a significant pathogen within the Alphaherpesvirinae subfamily, causing respiratory disease, abortions, and, in severe cases, equine herpesvirus myeloencephalopathy (EHM). While nasal swabs and blood samples are commonly used for real-time polymerase chain reaction (RT-PCR) diagnosis, variability in viral shedding necessitates exploring additional sample types. This study reports the first molecular detection of EHV-1 in ocular swabs from naturally infected horses during an outbreak in the Valencian Community in 2023. Nasal and ocular swabs were collected from ten symptomatic horses and analyzed via RT-PCR. EHV-1 was detected in all cases, with higher viral loads in nasal samples. Although nasal swabs remain the most reliable sample for EHV-1 detection, the presence of viral DNA in tear fluid suggests a previously unrecognized route of viral shedding. These findings support further investigation into the role of ocular secretions in the pathogenesis and epidemiology of EHV-1. Additional studies are needed to determine the clinical relevance and potential utility of ocular swabs in specific outbreak scenarios. Full article

(This article belongs to the Special Issue Advances in Endemic and Emerging Viral Diseases in Livestock)

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