Home About Browse Search
Svenska


Eradication of Aujeszky's disease (pseudorabies) virus from pig herds : alternatives to depopulation

Engel, Marie (1999). Eradication of Aujeszky's disease (pseudorabies) virus from pig herds : alternatives to depopulation. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Veterinaria, 1401-6257
ISBN 91-576-5437-9
[Doctoral thesis]

[img] PDF
45MB

Abstract

This thesis summarises and discusses the results of studies which were carried out to obtain experience with and knowledge about Aujeszky’s disease (AD) in pig herds as a basis for the National eradication programme in Sweden.This thesis summarises and discusses the results of studies which were carried out to obtain experience with and knowledge about Aujeszky’s disease (AD) in pig herds as a basis for the National eradication programme in Sweden.Breeding animals in 11 weaner pig-producing and 3 farrow-to-finish herds infected with Aujeszky’s disease virus (ADV) were followed serologically in order to quantify the seroconversion rate to ADV and to investigate whether it would be possible to eradicate the virus by gradually replacing seropositive animals with seronegative, either with or without implementing a vaccination programme. In unvaccinated herds blood samples were analysed by an ELISA test used for routine diagnosis. In vaccinated herds, marker vaccines (glycoprotein E negative vaccines) were used and blood samples were analysed by commercially available gE ELISA test kits.In the unvaccinated herds it was demonstrated that it is difficult to avoid contact between infected and uninfected animals under normal conditions, and that contact was frequent in these herds. Even so, transmission from latently infected animals to susceptibles appeared to be limited, as all the unvaccinated study herds experienced long periods without seroconversion and 3 herds became free from ADV during the study. However, once transmission takes place among unvaccinated animals, there is always a risk that this may lead to an outbreak. Three of the largest unvaccinated herds did experience severe outbreaks and vaccination was subsequently applied in these herds.All 7 herds which applied vaccination eradicated ADV. In these herds, no outbreaks occurred and the incidence of seroconversion was very low, except for one herd where gilts were placed in direct contact with unvaccinated fattening pigs.Today, vaccination against AD using marker vaccines is the main method of control. However, it appears that vaccination may promote risk behaviour in herd managers and it is important that basic principles of biosecurity are not neglected during a vaccination programme.

Authors/Creators:Engel, Marie
Title:Eradication of Aujeszky's disease (pseudorabies) virus from pig herds : alternatives to depopulation
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Veterinaria
Year of publishing :1999
Number:58
Number of Pages:49
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:91-576-5437-9
ISSN:1401-6257
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Clinical Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
Keywords:Aujeszky’s disease, pseudorabies, serological study, transmission, disease control, eradication, vaccination programme, risk behaviour
URN:NBN:urn:nbn:se:slu:epsilon-p-117457
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-117457
ID Code:28339
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Institutionen för idisslarmedicin och epidemiologi ( 970401-040630)
Deposited By: SLUpub Connector
Deposited On:14 Jun 2022 14:25
Metadata Last Modified:14 Jun 2022 15:05

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits