Detection in and circulation of Bluetongue virus among domestic ruminants in Madagascar

descriptionPublicationkeyboard_double_arrow_right Article 01 Apr 2015 English Publisher:Elsevier BVJournal:Veterinary Microbiology, volume 176, pages 268-273 (issn: 0378-1135,

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Authors: Andriamandimby, Soa Fy; Viarouge, Cyril; Ravalohery, Jean-Pierre; Reynes, Jean Marc; Sailleau, Corinne; Tantely, Luciano Michael; Elissa, Nohal; +4 Authors

doi: 10.1016/j.vetmic.2015.02.009

pmid: 25736861

Detection in and circulation of Bluetongue virus among domestic ruminants in Madagascar

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Abstract

So far, no published data was available concerning the circulation of Bluetongue virus (BTV) in Madagascar. During a survey on Rift Valley Fever, we were able to detect a virus belonging to BTV. Therefore, we conducted a study aiming at characterizing molecularly the BTV isolated and assess the importance of circulation of BTV in Madagascar. A total of 4393 sera from ruminants selected randomly by stratification and sampled in 30 districts of Madagascar were tested for BTV. Moreover, 175 cattle were followed during 11 months. Phylogenetic analyses were performed from virus isolated from unfed pools of mosquitoes. Overall, the estimated mean seroprevalence of infection at the national level was 95.9% (95% CI: [95.2-96.5]) in cattle and 83.7% (95% CI: [81.4-85.9]) in small ruminants. Estimation of incidence rate was 54 per 100 cattle-years assuming that the incidence rate is constant all year along. Phylogenetic analyses revealed that BTV detected belong to serotype 2. In conclusion, our results showed that BTV is endemic in Madagascar and highly prevalent among cattle. In our study we did not work on the vector involved in transmission of BTV in cattle. Thus, research should be conducted to better describe epidemiology of BTV in Madagascar including vectors and assess economic impact of the disease associated to BTV infections.

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Keywords

http://aims.fao.org/aos/agrovoc/c_27555, Male, MESH: Bluetongue virus/genetics, bovin, Endemic Diseases, Rift Valley Fever, http://aims.fao.org/aos/agrovoc/c_2615, DNA/veterinary, MESH: Bluetongue/epidemiology, ruminant, MESH: Base Sequence, L73 - Maladies des animaux, http://aims.fao.org/aos/agrovoc/c_16411, [SDV.MHEP.MI]Life Sciences [q-bio]/Human health and pathology/Infectious diseases, Seroepidemiologic Studies, MESH: Animals, MESH: Phylogeny, http://aims.fao.org/aos/agrovoc/c_4510, surveillance épidémiologique, http://aims.fao.org/aos/agrovoc/c_6695, Phylogeny, MESH: Rift Valley Fever/epidemiology, [SDV.MP.VIR] Life Sciences [q-bio]/Microbiology and Parasitology/Virology, [SDV.MHEP.ME] Life Sciences [q-bio]/Human health and pathology/Emerging diseases, [SDV.MHEP.ME]Life Sciences [q-bio]/Human health and pathology/Emerging diseases, MESH: Rift Valley Fever/virology, Ruminants, évaluation du risque, MESH: Cattle, dynamique des populations, http://aims.fao.org/aos/agrovoc/c_1391, MESH: Endemic Diseases, [SDV.MP.VIR]Life Sciences [q-bio]/Microbiology and Parasitology/Virology, [SDV.MHEP.MI] Life Sciences [q-bio]/Human health and pathology/Infectious diseases, épidémiologie, Female, MESH: Ruminants/virology, MESH: Bluetongue virus/isolation & purification, http://aims.fao.org/aos/agrovoc/c_32579, virus bluetongue, MESH: Madagascar/epidemiology, 570, MESH: Bluetongue virus/immunology, http://aims.fao.org/aos/agrovoc/c_28665, Molecular Sequence Data, Cattle Diseases, MESH: Cattle Diseases/virology, Bluetongue, http://aims.fao.org/aos/agrovoc/c_976, MESH: Sequence Analysis, MESH: Bluetongue/virology, phylogénie, Madagascar, http://aims.fao.org/aos/agrovoc/c_9342, Animals, petits ruminants, http://aims.fao.org/aos/agrovoc/c_13325, http://aims.fao.org/aos/agrovoc/c_6111, http://aims.fao.org/aos/agrovoc/c_37932, immunodiagnostic, MESH: Molecular Sequence Data, MESH: Seroepidemiologic Studies, [SDV.BA.MVSA]Life Sciences [q-bio]/Animal biology/Veterinary medicine and animal Health, Base Sequence, fièvre catarrhale ovine, MESH: Cattle Diseases/epidemiology, [SDV.BA.MVSA] Life Sciences [q-bio]/Animal biology/Veterinary medicine and animal Health, Sequence Analysis, DNA, MESH: Male, [SDV.SPEE] Life Sciences [q-bio]/Santé publique et épidémiologie, Enquête pathologique, Bovidae, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, Cattle, MESH: Female, Bluetongue virus

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