TY - JOUR
T1 - Schmallenberg virus experimental infection of sheep
AU - Wernike, Kerstin
AU - Hoffmann, Bernd
AU - Bréard, Emmanuel
AU - Bøtner, Anette
AU - Ponsart, Claire
AU - Zientara, Stéphan
AU - Lohse, Louise
AU - Pozzi, Nathalie
AU - Viarouge, Cyril
AU - Sarradin, Pierre
AU - Leroux-Barc, Céline
AU - Riou, Mickael
AU - Laloy, Eve
AU - Breithaupt, Angele
AU - Beer, Martin
PY - 2013
Y1 - 2013
N2 - Since late 2011, a novel orthobunyavirus, named Schmallenberg virus (SBV), has been implicated in many cases of severely malformed bovine and ovine offspring in Europe. In adult cattle, SBV is known to cause a mild transient disease; clinical signs include short febrile episodes, decreased milk production and diarrhoea for a few days. However, the knowledge about clinical signs and pathogenesis in adult sheep is limited.In the present study, adult sheep of European domestic breeds were inoculated with SBV either as cell culture grown virus or as virus with no history of passage in cell cultures. Various experimental set-ups were used. Sampling included blood collection at different time points during the experimental period and selected organ material at autopsy.Data from this study showed, that the RNAemic period in sheep was as short as reported for cattle; viral genome was detectable for about 3–5 days by real-time RT-PCR. In total, 13 out of 30 inoculated sheep became RNAemic, with the highest viral load in animals inoculated with virus from low cell culture passaged or the animal passaged material. Contact animals remained negative throughout the study. One RNAemic sheep showed diarrhoea for several days, but fever was not recorded in any of the animals. Antibodies were first detectable 10–14 days post inoculation. Viral RNA was detectable in spleen and lymph nodes up to day 44 post inoculation.In conclusion, as described for cattle, SBV-infection in adult sheep predominantly results in subclinical infection, transient RNAemia and a specific antibody response. Maintenance of viral RNA in the lymphoreticular system is observed for an extended period.
AB - Since late 2011, a novel orthobunyavirus, named Schmallenberg virus (SBV), has been implicated in many cases of severely malformed bovine and ovine offspring in Europe. In adult cattle, SBV is known to cause a mild transient disease; clinical signs include short febrile episodes, decreased milk production and diarrhoea for a few days. However, the knowledge about clinical signs and pathogenesis in adult sheep is limited.In the present study, adult sheep of European domestic breeds were inoculated with SBV either as cell culture grown virus or as virus with no history of passage in cell cultures. Various experimental set-ups were used. Sampling included blood collection at different time points during the experimental period and selected organ material at autopsy.Data from this study showed, that the RNAemic period in sheep was as short as reported for cattle; viral genome was detectable for about 3–5 days by real-time RT-PCR. In total, 13 out of 30 inoculated sheep became RNAemic, with the highest viral load in animals inoculated with virus from low cell culture passaged or the animal passaged material. Contact animals remained negative throughout the study. One RNAemic sheep showed diarrhoea for several days, but fever was not recorded in any of the animals. Antibodies were first detectable 10–14 days post inoculation. Viral RNA was detectable in spleen and lymph nodes up to day 44 post inoculation.In conclusion, as described for cattle, SBV-infection in adult sheep predominantly results in subclinical infection, transient RNAemia and a specific antibody response. Maintenance of viral RNA in the lymphoreticular system is observed for an extended period.
KW - Schmallenberg virus
KW - Orthobunyavirus
KW - Sheep
KW - Experimental infection
U2 - 10.1016/j.vetmic.2013.06.030
DO - 10.1016/j.vetmic.2013.06.030
M3 - Journal article
C2 - 23972950
SN - 0378-1135
VL - 166
SP - 461
EP - 466
JO - Veterinary Microbiology
JF - Veterinary Microbiology
IS - 3-4
ER -