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Open AccessCommunication

Presence of Antibodies against Bluetongue Virus (BTV) in Sheep 5 to 7.5 Years after Vaccination with Inactivated BTV-8 Vaccines

1
Sheep Veterinary Practice Strobel, Am Hopfenberg 8, 89352 Stoffenried, Germany
2
Clinic for Swine and Small Ruminants, Forensic Medicine and Ambulatory Service, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
3
Friedrich-Loeffler-Institute, Federal Research Institute for Animal Health, Suedufer 10, 17493 Greifswald–Riems, Germany
4
Clinic for Ruminants with Ambulatory and Herd Health Services, Ludwig-Maximilians-University Munich, Sonnenstr. 16, 85764 Oberschleissheim, Germany
5
Friedrich-Loeffler-Institute, Institute of Farm Animal Genetics, Hoeltystr. 10, 31535 Neustadt, Germany
*
Author to whom correspondence should be addressed.
Viruses 2019, 11(6), 533; https://doi.org/10.3390/v11060533
Received: 26 March 2019 / Revised: 31 May 2019 / Accepted: 6 June 2019 / Published: 8 June 2019
(This article belongs to the Special Issue Virus-Vector-Host Interactions of Culicoides-Borne Diseases)
Thirty-six female sheep, previously vaccinated against Bluetongue virus serotype 8 (BTV-8) using inactivated vaccines, were included in this field study. In Germany, vaccination was compulsory in 2008 and 2009, voluntary in 2010 and early 2011, and later, was prohibited in 2011. Due to their age, eighteen sheep had been vaccinated for two or more consecutive years, while a further eighteen animals had only been vaccinated once or not at all. The sheep were blood sampled five (n = 31) to 7.5 years (n = 5) after their last vaccination. All serum samples (n = 36) were tested for BTV group-specific antibodies by an ELISA (IDScreen® Bluetongue Competition assay, ID Vet). In five of the animals, the BTV-8 serotype-specific antibody titers were measured by serum neutralization (SN). The majority of sheep that were vaccinated annually for two or more years showed a positive ELISA (14/18 sheep) and a SN (two of two sheep) result 5 years after their last vaccination. Most of the sheep vaccinated fewer than twice showed a negative ELISA result 5 to 7.5 years after their last vaccination (13/18 animals). The three animals in this group tested by SN showed one negative and two positive results. This short communication is the first to describe the presence of BTV antibodies in sheep 5 to 7.5 years after vaccination with inactivated BTV-8 vaccines. View Full-Text
Keywords: bluetongue virus; sheep; vaccination; inactivated vaccine; antibody duration; BTV-8 bluetongue virus; sheep; vaccination; inactivated vaccine; antibody duration; BTV-8
MDPI and ACS Style

Hilke, J.; Strobel, H.; Woelke, S.; Stoeter, M.; Voigt, K.; Moeller, B.; Bastian, M.; Ganter, M. Presence of Antibodies against Bluetongue Virus (BTV) in Sheep 5 to 7.5 Years after Vaccination with Inactivated BTV-8 Vaccines. Viruses 2019, 11, 533.

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