Abstract
In the present study, healthy goats and sheep (n = 5) that were confirmed negative for peste des petits ruminants virus (PPRV) antibodies by monoclonal antibody-based competitive ELISA and by serum neutralization test and for PPRV antigen by s-ELISA were vaccinated with Sungri/96. A quantitative study was carried out to compare the proteome of peripheral blood mononuclear cells (PBMCs) of vaccinated goat and sheep [5 days post-vaccination (dpv) and 14 dpv] vs. unvaccinated (0 day) to divulge the alteration in protein expression following vaccination. A total of 232 and 915 proteins were differentially expressed at 5 and 14 dpv, respectively, in goats. Similarly, 167 and 207 proteins were differentially expressed at 5 and 14 dpv, respectively, in sheep. Network generated by Ingenuity Pathway Analysis was “infectious diseases, antimicrobial response, and inflammatory response,” which includes the highest number of focus molecules. The bio functions, cell-mediated immune response, and humoral immune response were highly enriched in goats at 5 dpv and at 14 dpv. At the molecular level, the immune response produced by the PPRV vaccine virus in goats is effectively coordinated and stronger than that in sheep, though the vaccine provides protection from virulent virus challenge in both. The altered expression of certain PBMC proteins especially ISG15 and IRF7 induces marked changes in cellular signaling pathways to coordinate host immune responses.
Introduction
Peste des petits ruminants (PPR) is a severe, contagious viral disease of small ruminants, mainly sheep and goats, caused by peste des petits ruminants virus (PPRV) belonging to the genus Morbillivirus and family Paramyxoviridae (). The disease is endemic in many countries of Asia, the Middle East, and Africa (). The disease is clinically manifested by fever, anorexia, ocular and nasal discharge, erosions and ulcers in the digestive mucosa, diarrhea, and marked leukopenia with immunosuppression and may lead to death (). The disease is classified as a World Organisation for Animal Health (OIE)-listed disease. The disease causes severe economic losses, as mortality and morbidity can reach 90–100% ().
Live attenuated vaccines Nigeria 75/1 and Sungri/96 have been widely used for the control of PPRV in Africa () and India (), respectively. Sungri/96 vaccine is believed to provide protective immunity in sheep and goats for years (). This immune response that results in the protection of hosts after vaccination is attributed to innate and both humoral and cell-mediated immunity, which, however, warrants further investigation (–).
It is well-known that peripheral blood mononuclear cells (PBMCs) play a vital role in the immune response () and have been widely used in an in vitro model to study host–PPRV interactions and in other morbillivirus infections (, , , ). Transcriptome profiling has uncovered transcription factors and miRNAs in modulating the immune response to PPRV Sungri/96 live attenuated vaccine strain in vitro in PBMCs () and virulent PPRV infection (, ). To date, there are no in vivo or in vitro reports of proteomics profiling of PBMCs in PPRV-vaccinated goats and sheep.
Vaccination of sheep and goats with live attenuated virus is shown to elicit protective immunity to infection with virulent PPRV; yet, the mechanisms that induce immune response and confer protection from virulent PPRV strains are still not completely clear. In this study, we examine the proteome changes that occur in PBMCs of sheep and goat in response to PPRV vaccination, which contribute to the development of immunity, by identifying differentially expressed proteins (DEPs) and biological pathways associated at the early time points. To establish differences in vaccine response in sheep and goat, DEPs in PBMCs at 5 and 14 dpv in comparison to 0 dpv as control were identified. Thereafter, we performed extensive pathway and network analyses to find out differences in the underlying protein pathways associated with PBMCs of sheep and goat at different time points.
Materials and Methods
Animal Experiment, Ethics Statement, and Virus
In the present study, healthy goats (n = 5) and sheep (n = 5) confirmed negative for PPRV antibodies by monoclonal antibody-based competitive ELISA () and by serum neutralization test (SNT) () and for PPRV antigen by s-ELISA () were used. PPRV live attenuated vaccine virus (Sungri/96) was used in this experiment to vaccinate sheep and goats. The study was carried out after obtaining permission from the Indian Veterinary Research Institute Animal Ethics Committee (IVRI-IAEC) under the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA), India.
Study Design
Goats and sheep (each n = 5) were vaccinated, and PBMCs were isolated from the animals before (0 day) and 5 and 14 days post-vaccination (5 and 14 dpv, respectively). Thereafter, proteome profiling of PBMCs isolated at the different time points, 0 day, 5 dpv, and 14 dpv, was carried out. DEPs at 5 and 14 dpv were identified, respectively, by comparing the proteome data of 5- and 14-dpv PBMCs with 0-day PBMC data.
Serological Response to Vaccination/Infection
Detection of PPRV antibodies in the sera samples collected from PPRV-vaccinated animals was carried out using monoclonal antibody (directed to H protein)-based competitive-ELISA test (). The samples that had a percent inhibition (PI) value of >40% were considered positive.
Isolation of Peripheral Blood Mononuclear Cells and Protein Isolation
The PBMC subset isolation was carried out following the standard procedure as described in our previous study (). For protein isolation, ~107 cells of PBMCs were taken in lysis buffer [50 mM Tris Buffer + protease inhibitor cocktail (PIC) + phenylmethylsulfonyl fluoride (PMSF)], homogenized on ice, centrifuged at 14,000 rpm, and the supernatant was collected into a separate tube (Tris Buffer extract). Urea lysis buffer was added to the cell pellet. This was followed by centrifugation at 14,000 rpm and collection of the resultant supernatant. For quality check, the supernatant was run on a sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Protein concentration was determined using the Bradford assay, and 100 μg of the samples was taken for digestion.
Sample Preparation for Liquid Chromatography–Mass Spectrometry Analysis
The samples were added with 100 mM dithiothreitol (DTT) for 1 h at 95°C, treated with 250 mM iminodiacetic acid (IDA), and kept for 45 min at room temperature in the dark. This was followed by digestion of the sample with trypsin and overnight incubation at 37°C. Thereafter, formic acid (1%) was added to it, incubated at 37°C for 1 h and vacuum dried. The resulting sample was dissolved in 10 μl of 0.1% formic acid and centrifuged at 10,000 × g. The supernatant was injected on C18 Nano-LC column for separation of peptides. The Waters Synapt G2 Q-TOF instrument for MS and MS/MS were used for analysis.
Liquid Chromatography–Mass Spectrometry Analysis
Through MassLynx 4.1 Waters, the raw data were processed, and through PLGS software, the proteins were identified. The threshold while considering a protein was as follows: Minimum number of peptides to be found for a protein, 2; Minimum number of fragment (MSMS) ions in a peptide, 3; Minimum number of fragment (MSMS) ions in a protein, 7; Peptide mass tolerance, 30 ppm; and Fragment ion mass tolerance, 70 ppm. The quantification of the protein was carried out through Expression analysis package of the PLGS software, and the identified proteins in the three runs of each sample were compared with each other as control (healthy) and vaccinated samples.
Ingenuity Pathway Analysis
Data were analyzed using QIAGEN's IPA (QIAGEN, Redwood City, USA). The uniport ID of DEPs was converted into gene ID from uniport data set, and this list of genes with corresponding fold change was uploaded to IPA for downstream analysis. The canonical pathways and functional processes of biological importance that were the most significant were identified using the list of DEPs identified with liquid chromatography–mass spectrometry (LC-MS) and the Ingenuity Pathways Knowledge Base (IKB). Pathway enrichment p-values (Fisher's exact test) and activation z-scores were calculated by IPA. Core analysis and comparison analysis for each dataset were performed to know significant (p < 0.05) and activated (Z score > 2) or inactivated (Z score < −2) canonical pathways. Network analysis was also performed.
Results
In this study, sheep and goats screened -ve for PPRV antibodies by competitive-ELISA and SNT and for PPRV antigen by s-ELISA were used. Vaccinated goats were found seropositive by 9 dpv, while sheep had an idiosyncratic response in the range of 9–14 dpv for different animals ().
Proteomics Profiling of Peripheral Blood Mononuclear Cells of Vaccinated Goats and Sheep Results in Identification of Unique and Common Differentially Expressed Proteins
A quantitative study was carried out to compare the proteome of PBMCs of vaccinated goat and sheep (5 and 14 dpv) vs. unvaccinated (0 day). A total of 232 and 915 proteins were differentially expressed at 5 and 14 dpv, respectively, in goats. Similarly, 167 and 207 proteins were differentially expressed at 5 and 14 dpv, respectively, in sheep (Figure 1A) at a cutoff fold change >2 for upregulated and <0.5 for downregulated proteins. The number of upregulated DEPs in goats at 5 and 14 dpv was 111 and 64, respectively, whereas this was 6 and 45 in sheep, respectively (Figure 1B). A higher number of significantly upregulated proteins were found in goats at 5 dpv. A total number of 134 DEPs were found common among “5dpv-Goats,” “14dpv-Goats,” “5dpv-Sheep,” and “14dpv-Sheep” (Figure 1C). FGG, SOCS7, TNFSF10, and CD274 were the most upregulated DEPs at 5 and 14 dpv in goat and sheep, respectively.
Figure 1
Protein Set Enrichment Analysis Using the Cytoscape Plugin ClueGO Identified Gene Ontology Terms Enriched in Peripheral Blood Mononuclear Cells of Vaccinated Goats and Sheep
Immune system processes enriched in goats at 5 dpv were type I interferon signaling, cytoplasmic PRR signaling pathway in response to virus, interferon gamma-mediated signaling pathway, regulation of innate immune response, and regulation of adaptive immune response (Figure 2A), whereas at 14 dpv, response to type I interferon, type I interferon signaling, interferon gamma-mediated signaling pathway, cytoplasmic PRR signaling pathway in response to virus, regulation of innate immune response, negative regulation of T-cell activation, and regulation of adaptive immune response were found enriched (Figure 2B). In vaccinated sheep at 5 dpv, interferon gamma-mediated signaling pathway, response to type I interferon, cytoplasmic PRR signaling pathway in response to virus, regulation of innate immune response, and regulation of type 2 immune response were enriched (Figure 2C). At 14 dpv in sheep, response to type I interferon, interferon gamma-mediated signaling pathway, cytoplasmic PRR signaling pathway in response to virus, regulation of innate immune response, regulation of adaptive immune response, and positive regulation of B-cell proliferation were enriched (Figure 2D).
Figure 2
Ingenuity Pathway Analysis Reveals Canonical Pathways That Were Perturbed in Peripheral Blood Mononuclear Cells of Vaccinated Goats and Sheep
Core analysis for each dataset was performed to know significant (p < 0.05) and activated (Z score > 2) or inactivated (Z score < −2) canonical pathways. In vaccinated goats at 5 dpv, all the pathways were found to be activated (Z score > 2) like dendritic cell maturation, TREM1 signaling, nuclear factor (NF)-κB signaling, phosphoinositide 3-kinase (PI3K) signaling in B lymphocytes, etc. Dendritic cell maturation pathway was the most significantly enriched (–log p-value) pathway. The ratio—number of the proteins in the dataset mapping to each specific pathway divided by the total number of proteins in the pathway—was highest for TREM1 pathway (Figure 3A). In vaccinated goats at 14 dpv, all the pathways, e.g., interferon signaling, PI3K signaling in B lymphocytes, protein kinase C (PKC) theta signaling in T lymphocytes, B-cell receptor signaling, CD28 signaling in T helper cells, etc., were activated except the nuclear factor (NF)-κB activation by viruses and inflammasome pathway. Interferon signaling was the most significantly enriched (–log p-value) pathway with highest ratio also (Figure 3B). In vaccinated sheep at 5 dpv, PKC theta signaling in T lymphocytes and inducible costimulator (ICOS)–inducible costimulator ligand (ICOSL) signaling in T helper cells were activated. PKC theta signaling in T lymphocytes was having the highest ratio with significant enrichment (Figure 4A). In vaccinated sheep at 14 dpv, all the pathways, e.g., Th1 pathway, Th2 pathway, CD40 signaling, interleukin (IL)-9 signaling pathway, etc., were activated except the NF-κB activation by viruses. Th1 pathway was the most significantly enriched (–log p-value) pathway, and IL-9 signaling pathway had the highest ratio (Figure 4B).
Figure 3
Figure 4
Annotation of Differentially Expressed Proteins in Peripheral Blood Mononuclear Cells of Vaccinated Goats and Sheep
The DEPs in vaccinated goats and sheep at 5 and 14 dpv have been characterized with specific bio functions in IPA. DEPs of vaccinated goats at 5 dpv were distributed into 84 bio functions activated (Z score > 2) or inactivated (Z score < −2) (Supplementary Table 1). Stimulation of cells, phosphorylation of protein, and transcription of RNA were the top 3 activated bio functions, and the number of proteins involved in each bio function was 25, 39, and 80, respectively. DEPs of vaccinated goats at 14 dpv were distributed into 48 bio functions activated (Z score > 2) or inactivated (Z score < −2) (Supplementary Table 2). Apoptosis of epithelial cells, function of mononuclear leukocytes, immune response of cells, and function of lymphatic system cells were the top 4 activated bio functions, and the number of proteins involved in each bio function was 61, 59, 114, and 62, respectively. DEPs of vaccinated sheep at 5 dpv were distributed into 22 bio functions activated (Z score > 2) or inactivated (Z score < −2) (Supplementary Table 3). Quantity of IgG, quantity of immunoglobulin, quantity of double-positive thymocyte, and production of protein were the top 4 activated bio functions, and the number of proteins involved in each bio function was 19, 28, 10, and 32, respectively. DEPs of vaccinated sheep at 14 dpv were distributed into 84 bio functions activated (Z score > 2) or inactivated (Z score < −2) (Supplementary Table 4). Quantity of leukocytes, quantity of lymphatic system cells, quantity of mononuclear leukocytes, and proliferation of B lymphocytes were the top 4 activated bio functions, and the number of proteins involved in each bio function was 76, 67, 65, and 34, respectively.
Network Analysis Identified the Key Networks in Peripheral Blood Mononuclear Cells of Vaccinated Goats and Sheep
In vaccinated goats at 5 dpv, 19 networks were generated, out of which networks 3, 9, 11, and 15 were overlapping (Supplementary Table 5). The network with the highest score (43) was “infectious diseases, antimicrobial response, and inflammatory response,” with 24 focus molecules (Figure 5A). The key proteins upregulated in the highest scoring network were ISG15, IRF7, IL1B, TNFSF10, etc. In vaccinated goats at 14 dpv, 25 networks were generated, out of which networks 2, 4, 6, 9, 13, 23, and 24 were overlapping (Supplementary Table 6). The network with the highest score (40) was “developmental disorder, hereditary disorder, metabolic disease,” with 27 focus molecules (Figure 5B). Furthermore, “infectious diseases, antimicrobial response, and inflammatory response” was the second network with scores of 36 and 25 focus molecules. The key proteins upregulated in the highest scoring network were TMPRSS2, MEF2C, HES1, ACTC1, etc., and the key proteins upregulated in the second highest scoring network were ISG15, UBA7, MX1, RSAD2, IFIT3, etc. In vaccinated sheep at 5 dpv, 14 networks were generated, out of which networks 5, 7, and 9 were overlapping (Supplementary Table 7). The network with the highest score () was “antimicrobial response, inflammatory response, infectious diseases,” with 20 focus molecules (Figure 6A). The key proteins upregulated in the highest scoring network were S100A10, RSAD2, DDX58, IFIH1, etc. In vaccinated sheep at 14 dpv, 18 networks were generated, out of which networks 6, 9, and 10 were overlapping (Supplementary Table 8). The network with the highest score () was “antimicrobial response, inflammatory response, infectious diseases,” with 21 focus molecules (Figure 6B). The key proteins upregulated in the highest scoring network were ISG15, IRF7, NFKB complex, TNFAIP2, HERC5, ACOD1, etc.
Figure 5
Figure 6
Comparison Analysis of Canonical Pathways Between Peripheral Blood Mononuclear Cells of Vaccinated Goats and Sheep
At 5 dpv, most of the immune-related pathways were found to be more significantly (–log p-value) enriched in goats than in sheep. Dendritic cell maturation, TREM1, NF-κB signaling, icos-icosL signaling in T helper cells, PI3K signaling in B lymphocytes, CD27 signaling in lymphocytes, etc., showed higher enrichment in goats, whereas in sheep, the role of nuclear factor of activated T cells (NFAT) in the regulation of the immune response was highly enriched (Figure 7A). At 14 dpv, Th1 pathway, Th2 pathway, high-mobility group box protein 1 (HMGB1) signaling, Fc gamma receptor-mediated phagocytosis, macrophage migration inhibitory factor (MIF) regulation of innate immunity, PKC theta signaling, B-cell receptor signaling, CD28 signaling T helper cells, inflammasone pathway, and CD27 signaling in lymphocytes were significantly enrichment in goats. In sheep, granulocyte-macrophage colony-stimulating factor (GM-CSF) signaling, NF-κB signaling by viruses, B-cell activating factor signaling, Fc gamma R II signaling in B lymphocytes, and p38 mitogen-activated protein kinase (MAPK) signaling were enriched in sheep (Figure 7B). The bio functions cell-mediated immune response and humoral immune response were highly enriched in goats at 5 dpv (Figure 8A). At 14 dpv, cell-mediated immune response was highly enriched in goats, with humoral immune response being equally enriched (Figure 8B).
Figure 7
Figure 8
Discussion
Proteomics facilitates the identification of system-wide changes in protein expression (, ) and in combination with bioinformatics analyses has been used to study the host–pathogen interaction (). Since changes in protein expression in PBMCs of vaccinated goats and sheep with PPRV were unknown, LC-MS was applied in this study.
A quantitative study carried out to compare the proteome of PBMCs of vaccinated goat and sheep (5 and 14 dpv) vs. control (0 dpv) revealed enrichment of immune system processes and orchestration of antiviral state by type I interferon signaling, cytoplasmic PRR signaling pathway in response to virus, interferon gamma-mediated signaling pathway, regulation of innate immune response, regulation of adaptive immune response, negative regulation of T-cell activation, regulation of type 2 immune response, positive regulation of B-cell proliferation. From transcriptome analysis of PBMCs in in vitro studies by RNA sequencing, PPRV is reported to create a strong antiviral state by enrichment of Toll-like receptor (TLR) signaling pathways, innate immune response, inflammatory response, positive regulation of signal transduction and cytokine production, RIG signaling pathway, chemokine signaling pathway, Class-I major histocompatibility complex (MHC) presentation and processing, and classical antibody-mediated complement activation (, , ). Initially, the PPR vaccine virus induces an innate immune response, which further shapes a strong adaptive immune response.
“Infectious diseases, antimicrobial response, and inflammatory response” was the network generated by IPA with highest score at 5 dpv vaccinated goats, with the second highest score at 14 dpv vaccinated goats, and highest score at 5 and 14 dpv vaccinated sheep. The key proteins identified in network analysis were ISG15, IRF7, IL1B, and TNFSF10 at 5 dpv and ISG15, UBA7, MX1, RSAD2, IFIT3, and TMPRSS2 at 14 dpv in goats. At the transcriptome level, the high expression levels of viral sensors MDA5 (IFIH1), R1G-1 (DDX58), and ISGS (ISG15, Mx1, Mx2, RSAD2, IFIT3, and IFIT5) and transcription factors like IRF-7 and STAT-1 that induce ISG expression were found in lymphocytes during virulent PPRV infection (). In sheep, S100A10, RSAD2, DDX58, and IFIH1 were the key proteins at 5 dpv, and ISG15, IRF7, NFKB complex, TNFAIP2, HERC5, and ACOD1 were the key proteins at 14 dpv. ISG15, IRF7, MX1, RSAD2, and IFIT3 have been found to play a vital role in modulating immune response against the viral infection (–). The upregulation of genes of the key immune molecules like ISG15 in all cell subsets and IFIT3, MX1, and ISG15 in certain cell subsets of the sheep PBMCs was found at earlier stages (5 dpv) of PPRV vaccination (). In goats, the elevated levels of the genes of ISG20, ISG15, IRF7, various IFITs, MX1, and MX2 was found at 5 dpv (). The altered expression of these PBMC proteins, identified following PPRV vaccination of sheep and goats, suggests marked changes in cellular signaling pathways to modulate host responses.
At 5 dpv, most of the immune-related pathways were found to be more significantly (–log p-value) enriched in goats than in sheep. Dendritic cell maturation, TREM1 signaling, NF-κB signaling, ICOS-ICOSL signaling in T helper cells, PI3K signaling in B lymphocytes, CD27 signaling in lymphocytes, etc., showed higher enrichment in goats. TREM1 regulates T-cell proliferation and activates antigen-presenting cells (, 35). NF-κB signaling induces transcription of cytokines and antivirals (36). ICOSL-mediated signaling, PI3K signaling, and CD27 signaling stimulate T- and B-cell differentiation and maturation (, , 37–39). The bio functions cell-mediated immune response and humoral immune response were highly enriched in goats at 5 dpv. At 14 dpv, cell-mediated immune response showed higher enrichment in goats, with humoral immune response being equally enriched. The antibody titer is reported to be lower in sheep compared to goats especially until 11 dpv (). A plateau in antibody titer is maintained from 11 dpv onward, which is more evident in goats (). So, it can be inferred that the magnitude of immune response was found to be higher and earlier in goats than in sheep.
Conclusion
Proteome data analysis revealed that at the molecular level, the immune response produced by the PPRV vaccine virus is stronger in goat than that in sheep, but the vaccine provides equal protection in both. The altered expression of certain PBMC proteins especially ISG15 and IRF7 may result in marked changes in cellular signaling pathways to modulate host immune responses.
Funding
This study was supported in part by the Centre for Agricultural Bioinformatics (ICAR-IASRI) (CABin/100644/16103/801/10133) and SubDIC (BTISnet), ICAR-IVRI.
Publisher's Note
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Statements
Data availability statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Ethics statement
The animal study was carried out after obtaining permission from Indian Veterinary Research Institute Animal Ethics Committee (IVRI - IAEC) under the Committee for Control and Supervision of Experiments on Animals(CPCSEA), India.
Author contributions
RS, BPM, and RG conceived and designed the research and proofread the manuscript. KR and DM performed the vaccine testing experiment. SW, ARS, and SS conducted the wet lab work. SW, ARS, RK, MP, and RG analyzed the data. SW, ARS, RK, AS, and BM helped in manuscript drafting and editing. All authors contributed to the article and approved the submitted version.
Acknowledgments
We thank the Department of Biotechnology, Ministry of Science and Technology (DBT), for providing fellowship and contingency for students–SW (DBT/2014/IVRI/171) and ARS (DBT/2014/IVRI/170).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Supplementary material
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fvets.2021.670968/full#supplementary-material
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Summary
Keywords
Sungri/96, PPRV, proteome, immunity, vaccine
Citation
Wani SA, Sahu AR, Khan RIN, Praharaj MR, Saxena S, Rajak KK, Muthuchelvan D, Sahoo A, Mishra B, Singh RK, Mishra BP and Gandham RK (2021) Proteome Modulation in Peripheral Blood Mononuclear Cells of Peste des Petits Ruminants Vaccinated Goats and Sheep. Front. Vet. Sci. 8:670968. doi: 10.3389/fvets.2021.670968
Received
22 February 2021
Accepted
31 May 2021
Published
22 September 2021
Volume
8 - 2021
Edited by
Dirk Werling, Royal Veterinary College (RVC), United Kingdom
Reviewed by
Santhamani Ramasamy, Public Health Research Institute (PHRI), United States; Jonas Johansson Wensman, Swedish University of Agricultural Sciences, Sweden
Updates
Copyright
© 2021 Wani, Sahu, Khan, Praharaj, Saxena, Rajak, Muthuchelvan, Sahoo, Mishra, Singh, Mishra and Gandham.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Ravi Kumar Gandham gandham.ravikumar@icar.gov.in; gandham71@gmail.comBishnu Prasad Mishra bpmishra_1@hotmail.comR. K. Singh rks_virology@rediffmail.com
†These authors have contributed equally to this work
This article was submitted to Veterinary Infectious Diseases, a section of the journal Frontiers in Veterinary Science
Disclaimer
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