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Schmitz KS, Eblé PL, van Gennip RGP, Maris-Veldhuis MA, de Vries RD, van Keulen LJM, de Swart RL, van Rijn PA. Pathogenesis of wild-type- and vaccine-based recombinant peste des petits ruminants virus (PPRV) expressing EGFP in experimentally infected domestic goats. J Gen Virol 2023; 104. [PMID: 36757863 DOI: 10.1099/jgv.0.001828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023] Open
Abstract
Peste des petits ruminants virus (PPRV) is a highly contagious morbillivirus related to measles and canine distemper virus, mostly affecting small ruminants. The corresponding PPR disease has a high clinical impact in goats and is characterized by fever, oral and nasal erosions, diarrhoea and pneumonia. In addition, massive infection of lymphoid tissues causes lymphopaenia and immune suppression. This results in increased susceptibility to secondary bacterial infections, explaining the observed high mortality in some outbreaks. We studied the pathogenesis of PPR by experimental inoculation of Dutch domestic goats with a recombinant virulent PPRV strain modified to express EGFP and compared it to an EGFP-expressing vaccine strain of PPRV. After intratracheal inoculation with virulent PPRV, animals developed fever, viraemia and leucopaenia, and shed virus from the respiratory and gastro-intestinal tracts. Macroscopic evaluation of fluorescence at the peak of infection 7 days post-inoculation (dpi) showed prominent PPRV infection of the respiratory tract, lymphoid tissues, gastro-intestinal tract, mucosae and skin. Flow cytometry of PBMCs collected over time demonstrated a cell-associated viraemia mediated by infected lymphocytes. At 14 dpi, pathognomonic zebra stripes were detected in the mucosa of the large intestine. In contrast, vaccine strain-inoculated goats remained largely macroscopically fluorescence negative and did not present clinical signs. A low-level viraemia was detected by flow cytometry, but at necropsy no histological lesions were observed. Animals from both groups seroconverted as early as 7 dpi and sera efficiently neutralized virulent PPRV in vitro. Combined, this work presents a study of the pathogenesis of wild type- and vaccine-based PPRV in its natural host. This study shows the strength of recombinant EGFP-expressing viruses in fluorescence-guided pathogenesis studies.
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Affiliation(s)
| | - Phaedra L Eblé
- Department of Virology, Wageningen Bioveterinary Research, Lelystad, Netherlands
| | - René G P van Gennip
- Department of Virology, Wageningen Bioveterinary Research, Lelystad, Netherlands
| | | | - Rory D de Vries
- Department of Viroscience, Erasmus MC, Rotterdam, Netherlands
| | - Lucien J M van Keulen
- Department of Infection Biology, Wageningen Bioveterinary Research, Lelystad, Netherlands
| | - Rik L de Swart
- Department of Viroscience, Erasmus MC, Rotterdam, Netherlands.,Department of Virology, Wageningen Bioveterinary Research, Lelystad, Netherlands
| | - Piet A van Rijn
- Department of Virology, Wageningen Bioveterinary Research, Lelystad, Netherlands.,Department of Biochemistry, Centre of Human Metabolomics, North-West University, Potchefstroom, South Africa
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Eloiflin RJ, Grau-Roma L, Python S, Mehinagic K, Godel A, Libeau G, Summerfield A, Bataille A, García-Nicolás O. Comparative pathogenesis of peste des petits ruminants virus strains of difference virulence. Vet Res 2022; 53:57. [PMID: 35804440 PMCID: PMC9270740 DOI: 10.1186/s13567-022-01073-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 05/22/2022] [Indexed: 11/15/2022] Open
Abstract
Peste des petits ruminants (PPR) is an acute disease of small ruminants caused by a morbillivirus. Clinical observation of the disease in the field revealed that several species of small ruminants are affected to varying degrees. This difference in disease-related effects could depend either on the host or on the virulence of the virus strain. A previous study highlighted the difference in virulence between two strains of PPRV used to infect Saanen goats. For this breed, PPRV Morocco 2008 strain (MA08) was highly virulent while PPRV Côte d’Ivoire 1989 (IC89) strain induced mild disease. Experimental studies generally based on healthy and young animals do not permit exploration of the natural variability of the host susceptibility to PPRV. Therefore, building on the previous study on Saanen goats, the current study focussed on this breed of goat and used commercially available animals with an unknown history of infection with other pathogens. Results confirmed the previous disease pattern for PPRV IC89 and MA08 strains. Viral RNA detection, macroscopic and histological lesions were stronger for the highly virulent MA08 strain. We show here for the first time that viral RNA can be detected in the tissues of vaccinated animals. Viral RNA was also detected for the first time in serum samples, which is in agreement with the role of circulating immune cells in transporting the virus into host target organs. Thus, this study provides insight into the pathogenesis of strains of different virulence of PPRV and will help to better understand the onset of the disease.
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Affiliation(s)
- Roger-Junior Eloiflin
- CIRAD, UMR ASTRE, 34398, Montpellier, France.,ASTRE, University of Montpellier, CIRAD, INRA, Montpellier, France
| | - Llorenç Grau-Roma
- Institute of Animal Pathology, Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012, Bern, Switzerland
| | - Sylvie Python
- Institute of Virology and Immunology, Mittelhäusern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Kemal Mehinagic
- Institute of Virology and Immunology, Mittelhäusern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland.,Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern 3001, Switzerland
| | - Aurélie Godel
- Institute of Virology and Immunology, Mittelhäusern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Geneviève Libeau
- CIRAD, UMR ASTRE, 34398, Montpellier, France.,ASTRE, University of Montpellier, CIRAD, INRA, Montpellier, France
| | - Artur Summerfield
- Institute of Virology and Immunology, Mittelhäusern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Arnaud Bataille
- CIRAD, UMR ASTRE, 34398, Montpellier, France. .,ASTRE, University of Montpellier, CIRAD, INRA, Montpellier, France.
| | - Obdulio García-Nicolás
- Institute of Virology and Immunology, Mittelhäusern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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