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Transplacental transmission of the Italian Bluetongue virus serotype 2 in sheep
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Keywords

Bluetongue virus serotype 2
Culicoides cell line
Ewe
Fetus
Transplacental transmission

How to Cite

Spedicato, M., Carmine, I., Teodori, L., Leone, A., Casaccia, C., Di Gennaro, A., Di Francesco, G., Marruchella, G., Portanti, O., Marini, V., Pisciella, M., Lorusso, A., & Savini, G. (2019). Transplacental transmission of the Italian Bluetongue virus serotype 2 in sheep. Veterinaria Italiana, 55(2), 131–141. https://doi.org/10.12834/VetIt.1913.10140.1

Abstract

In order to study the capability of a Bluetongue virus serotype 2 (BTV‑2) field isolate to cross the placental barrier, 2 groups of 5 pregnant ewes were infected with a field BTV‑2 Italian strain (Group A) or with the same strain passaged once in Culicoides cells (Kc) (Group B). Following infection, EDTA‑blood and serum samples were collected weekly and tested for the presence of BTV RNA/infectious virus and anti‑BTV‑2 antibodies, respectively. At lambing, precolostral EDTA‑blood and serum samples were collected from lambs and tested as before. The lambs were then sampled as scheduled for the dams. All sheep seroconverted on day 12 post‑infection (pi) and remained seropositive throughout the sampling period (day 68 pi). BTV was isolated from day 7 pi to day 14 pi in animals of Group A and from day 5 pi to day 12 pi in animals of Group B. None of the 14 lambs born had pre‑colostral antibodies. Three lambs born from two ewes of Group B were viraemic at birth and in one lamb infectious virus was isolated from blood up to 11 days of age. This study proved for the first time that a single passage of BTV‑2 field strain in Kc cells is able to give to BTV the ability to cross the placenta barrier and infect foetal tissues.
https://doi.org/10.12834/VetIt.1913.10140.1
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