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Vaccination and Eradication Programme against Aujeszky’s Disease in Five Swedish Pig Herds with Special Reference to Herd Owner Attitudes

Vaccinations och utrotningsprogram mot Aujeszkys sjukdom i fem svenska svinbesättningar: med speciell referens till djurägarattityder

Acta Veterinaria Scandinavica volume 40, pages 213–219 (1999)Cite this article

Abstract

A vaccination eradication programme against Aujeszky’s disease (AD), based on the use of gE-negative killed vaccine, was carried out between 1987 and 1992 in 5 Swedish weaner pig producing or farrow-to-finish herds, with 63 to 398 breeding animals. All breeding animals were tested at the start and the end of the programme. Seroprevalence to Aujeszky’s disease virus (ADV) ranged between 47% and 100% in the herds at the first test. During the programme, all breeding animals were vaccinated simultaneously every 4 months and ADV-free replacement animals were vaccinated shortly after arrival and boostered within a month. In one herd only, a limited number of fatteners were vaccinated.

The herds were declared free (gE-negative) 12 to 53 months after the start of the programme. When all seropositive breeding animals had been culled, the programme ended after 2 negative tests of the breeding animals. Seroconversion was limited in all herds but one, where initially no isolation unit was available for replacement animals. The attitude of the herd owners towards the programme and the special conditions prevailing in the herds are discussed. It is suggested that vaccination may promote risk behaviour of herd managers.

Sammanfattning

Ett vaccinations och utrotningsprogram mot Aujeszkys sjukdom (AD), baserat på användning av gE-negativt avdödat vaccin, utfördes i 5 svenska smågrisproducerande eller integrerade besättningar, med 63 till 398 suggor och galtar. Samtliga avelsdjur (suggor och galtar) testades i början och slutet av programmet. Vid ingångstesten varierade prevalensen av seropositiva avelsdjur mellan 47% och 100% i de olika besättningarna. Under programmet vaccinerades samtliga avelsdjur samtidigt var fjärde månad. Rekryteringsdjur fria från AD-virus vaccinerades strax efter ankomsten och en andra injektion gavs inom en månad. I endast en besättning vaccinerades även ett begränsat antal slaktsvin.

Besättningarna friförklarades 12 till 53 månader efter programmets start. När alla seropositiva avelsdjur hade slaktats, avslutades programmet efter 2 negativa tester av besättningens djur. Serokonvertering var begränsad i alla besättningar utom en, där inslussningsutrymme initialt saknades for rekryteringsdjur. Djurägarnas attityd till programmet och speciella forhållandena rådande i besättningarna diskuteras. Det föreslås art vaccinering kan ge upphov till riskbeteende hos djurägare.

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Authors and Affiliations

  1. Faculty of Veterinary Medicine, IME, Swedish University of Agricultural Sciences, Uppsala, Sweden

    M. Engel

  2. Swedish Animal Health Service, SE-750 07, Johanneshov, Sweden

    M. Wierup

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  1. M. Engel
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  2. M. Wierup
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Correspondence to M. Engel.

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Engel, M., Wierup, M. Vaccination and Eradication Programme against Aujeszky’s Disease in Five Swedish Pig Herds with Special Reference to Herd Owner Attitudes. Acta Vet Scand 40, 213–219 (1999). https://doi.org/10.1186/BF03547019

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Acta Veterinaria Scandinavica

ISSN: 1751-0147