Factors affecting the geographic distribution of pseudorabies (Aujeszky's disease) virus infection among swine herds in Illinois

Austin, Connie C.; Weigel, Ronald M.

doi:10.1016/0167-5877(92)90039-i

Cited by 20 publications

(6 citation statements)

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“…The proportion of ADV seropositive pigs in the present study was higher in herds located in municipalities with a high pig herd density. This corroborates with results of previous studies [4,27,46]. Transmission experiments of ADV showed that a higher density of pigs increases ADV spread because of the higher number of contacts between the pigs [6].…”

Section: Discussionsupporting

confidence: 92%

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Herd factors associated with the seroprevalences of four major respiratory pathogens in slaughter pigs from farrow-to-finish pig herds

et al. 2000

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-The objective of this study was to investigate sero-epidemiological aspects of Mycoplasma hyopneumoniae (Mh), influenza H 1 N 1 and H 3 N 2 viruses and Aujeszky disease virus (ADV) in fattening pigs from 150 randomly selected farrow-to-finish pig herds. Different herd factors were examined as potential risk indicators for the percentage of pigs with antibodies against the 4 pathogens. The median within-herd seroprevalences of the pathogens were: Mh 76%, H 1 N 1 100%, H 3 N 2 40% and ADV 53%. There was a positive association between the seroprevalences of both influenza viruses, and a negative association between the seroprevalences of ADV and H 1 N 1 . The percentage of pigs seropositive for Mh increased with the purchase of gilts and with the season (slaughter date in MarchApril). The within-herd seroprevalences of both influenza viruses were higher in the case of a higher density of pig herds in the municipality. A higher number of fattening pigs per pen additionally increased the risk of being seropositive for H 3 N 2 . The percentage of pigs with anti-gE-antibodies against the wild type ADV increased with higher airspace stocking density in the finishing unit, increasing herd size, increasing number of pig herds in the municipality and slaughter date in March-April. Increased seroprevalences for these 4 respiratory pathogens were mostly associated with pig density in the herd and its vicinity, the winter period, and with the purchase of gilts. Purchase of gilts, number of fattening pigs per pen and airspace stocking density are risk factors that can be managed directly by farmers striving to attain a high respiratory health status of pigs. pig / respiratory infections / seroprevalence / epidemiology Vet. Res. 31 (2000) 313-327 313

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Section: Discussionsupporting

confidence: 92%

“…Few studies [11,12,13] have so far investigated factors involved in the spread of influenza viruses within and between pig herds. The spread of ADV within and between pig herds has been the subject of many studies in Europe [11,12,15,23,39] and North-America [2,4,31,46]. However, the results of these studies are not always consistent.…”

Section: Introductionmentioning

confidence: 99%

Herd factors associated with the seroprevalences of four major respiratory pathogens in slaughter pigs from farrow-to-finish pig herds

et al. 2000

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“…Management system, topographical features, the distance between farms, pig density, and pig farm density have been proven as relevant risk factors for ADV maintenance in domestic pig farms (Marsh et al 1991;Austin and Weigel 1992;Leontides et al 1994;Tamba et al 2002). Epidemiological studies on ADV have also been carried out in wild boar (Müller et al 1998;Lutz et al 2003), although the role of the domestic pig in the epidemiology of ADV in wild boar populations has not been assessed before.…”

Section: Introductionmentioning

confidence: 98%

Epidemiological risk factors of Aujeszky’s disease in wild boars (Sus scrofa) and domestic pigs in Spain

et al. 2008

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An Aujeszky's disease (AD) control and eradication campaign started in Spain in 1995, and as a result, AD virus (ADV) seroprevalences have notably diminished in Spanish domestic pig herds, but eradication has not yet been achieved. Since the presence of ADV in Spanish wild boar populations can impede schemes to eradicate ADV in domestic pig, we conducted analyses of risk factors and investigated associations between the patterns of ADV seroprevalence at the municipal level in the wild boar and the domestic pig, respectively, in south-central Spain. There was a clear influence of individual factors on the risk of wild boar to test positive to ADV. Concerning the domestic pig, higher ADV seroprevalences were observed with increasing numbers of pigs per farm. Indoor pig farms showed higher seroprevalences than open-air farms. Our results show that, at least at the study scale, the level of ADV seroprevalence in domestic pig farms is not influenced by the level of ADV seroprevalence in the coexisting wild boar populations. Also, there was no influence of domestic pigs ADV seroprevalence on the risk of wild boars to test seropositive. Finally, there was no evidence for a statistical association between ADV seroprevalence levels in wild boar and domestic pig at the municipal level in the study region. These findings are of interest for both veterinary and public health authorities. Nevertheless, more effort is needed in order to elucidate the nature of particular ADV outbreaks in domestic pigs in the study region due to possible contacts with wild boars, which will probably require a molecular approach.

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“…When farm density is high, there may be more movement of animals and people among farms in proximity, and manure and waste disposal practices may increase the risk of TGE spread. Swine herd density was also reported to be a risk factor for county prevalence of pseudorabies virus in Illinois (Austin and Weigel, 1992). Similar factors may be important in the transmission of both diseases although no evidence exists for long-distance airborne-transmission of TGE virus among swine herds as has been described for pseudorabies (Chris-tensen et al, 1990) and porcine respiratory coronavirus (PRCV) infection (Henningsen et al, 1988).…”

Section: Discussionmentioning

confidence: 95%

Management and demographic factors associated with seropositivity to transmissible gastroenteritis virus in US swine herds, 1989–1990

Yanga

Gardner

Hurd

et al. 1995

Preventive Veterinary Medicine

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publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active. 24 (1995) 213-228 Management and demographic factors associated with seropositivity to transmissible gastroenteritis virus in US swine herds, [1989][1990] Abstract Serum neutralization testing was used to determine transmissible gastroenteritis (TGE) titers of up to 10 sows per herd (mean 8.7, median 10) for 392 herds that participated in the 3 month monitoring of sows and litters in the National Swine Survey. Of the sampled herds, 101 (25.8%) had sow seroprevalences of at least 80%, 79 (20.1%) had seroprevalences between 10 and 79%, and 212 (54.1%) were seronegative. For evaluation of risk factors for TGE seropositivity, analysis was restricted to herds with at least five tested sows and either 0% or at least 20% seropositive sows. In the logistic regression analysis, a herd was considered seropositive if at least 20% of sampled females had titers of 1:8 or higher (n = 160), and a herd was seronegative if all females had titers of under I:8 (n = 178). Factors considered for inclusion in logistic regression models included breeding herd size, biosecurity measures, pig introductions and movements, and access of possible nonporcine reservoirs to the facilities with pigs. After controlling for the effects of season, number of samples tested and TGE vaccination history, large female breeding herd size (at least 500 sows compared with the reference category of 100-199 sows) and purchase of more than 25 pigs from non-specific pathogen free (SPF) herds were associated with significantly (P < 0.05) higher odds of herd seropositivity (odds ratios 4.9 and 3.9, respectively). There was some evidence (P = 0.08) of an increased risk of seropositivity when there were more than two swine herds within a 3 mile radius of the study herd. * Corresponding author. 0167-5877/95/$09.50 0 1995 Elsevier Science B.V. All rights reserved SSDIO167-5877(95)00475-O XT. Yanga et al. /Prevenrive Veterinary Medicine 24 (1995) 213-228 Preventive Veterinary Medicine

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Factors affecting the geographic distribution of pseudorabies (Aujeszky's disease) virus infection among swine herds in Illinois

Cited by 20 publications

References 10 publications

Herd factors associated with the seroprevalences of four major respiratory pathogens in slaughter pigs from farrow-to-finish pig herds

Herd factors associated with the seroprevalences of four major respiratory pathogens in slaughter pigs from farrow-to-finish pig herds

Epidemiological risk factors of Aujeszky’s disease in wild boars (Sus scrofa) and domestic pigs in Spain

Management and demographic factors associated with seropositivity to transmissible gastroenteritis virus in US swine herds, 1989–1990

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