Immunisation against infections caused by Listeria monocytogenes in sheep
Gudding, R.; Nesse, L.L.; Grønstøl, H.
Veterinary Record 125(5): 111-114
1989
ISSN/ISBN: 0042-4900 PMID: 2505430 Document Number: 328530
Immunization against listeriosis in sheep using a live, attenuated vaccine was introduced in Norway in 1984. Since then 65 000 to 80 000 animals have been vaccinated annually. Information obtained by a questionnaire showed that the incidence of listeriosis decreased from approximately 4.0% before the introduction of the vaccine to 1.5% after vaccination started. The incidence of abortions was 0.7% in vaccinated flocks compared to 1.1% in unvaccinated flocks. There were a few adverse reactions in the vaccinated sheep.