EurekaMag.com logo
+ Site Statistics
References:
47,893,527
Abstracts:
28,296,643
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Estimating the rate of pseudorabies virus introduction into pig-finishing herds at regional level






Veterinary Quarterly 19(1): 5-9

Estimating the rate of pseudorabies virus introduction into pig-finishing herds at regional level

From February to June 1995, 5-12 blood samples were collected in each Dutch pig herd and tested for antibodies against pseudorabies virus (PRV). The percentage of PRV-seropositive pig-finishing herds in three regions with more than 1,000 pigs/km2 (regions 2, 4 and 7) was 6% (region 2), 12% (region 7), and 25% (region 4). The percentage of PRV-seropositive pig-finishing herds in five regions with fewer than 1,000 pigs/km2 (regions 1, 3, 5, 6, and 8) was 3% (region 1), 9% (region 3), 6% (region 5), 0% (region 6), and 4% (region 8). The small sample size allows only the detection of major outbreaks and the percentages of PRV-seropositive herds therefore under-estimate the actual virus circulation in the regions. The fraction of PRV introductions that will result in a major outbreak depends on the herd immunity and thus on the vaccination programme of the herds. By combining for each herd the occurrence or absence of a major outbreak with the herd immunity induced by the vaccination programme, we estimated the average rate at which PRV was introduced into finishing herds in the eight regions. The average number of PRV introductions per finishing herd per finishing period (16 weeks) in the pig-dense regions was estimated at 0.20 in region 2, 0.83 in region 4, and 0.48 in region 7. In the less densely populated regions this rate was estimated at 0.08 in region 1, 0.34 in region 3, 0.17 in region 5, 0.00 in region 6, and 0.09 in region 8. The eight regions could be classified into four areas with a statistically different (P < 0.05 in Mann Whithey U test) rate of PRV introduction: i) regions 1, 6, and 8; ii) regions 2 and 5; iii) regions 3 and 7; and iv) region 4.


Accession: 002831509

PMID: 9225421

DOI: 10.1080/01652176.1997.9694776



Related references

Morrison, R.B.; Thawley, D.G., 1989: Serologic status of pseudorabies virus in growing-finishing pigs in quarantined herds. It has been reported that pseudorabies virus (PRV) stops spreading within growing-finishing sections of a large percentage of infected farrow-to-finish herds. This study was designed to follow the PRV status of growing-finishing pigs in a sample o...

Morrison, R.B.; Thawley, D.G., 1989: Serological status of pseudorabies virus in growing-finishing pigs in quarantined herds. It has been reported that Aujeszky virus (AV) stops spreading within growing-finishing sections of a large percentage of infected farrow-to-finish herds. This study followed the (AV) status of growing-finishing pigs in a sample of infected herds....

Elbers, A.R.; Stegeman, J.A.; de Jong, M.F.; Lambers, J.H.; de Koning, R.; Hunneman, W.A., 1995: Estimating sample sizes for a two-stage sampling survey of seroprevalence of pseudorabies virus (PRV)-infected swine at a regional level in The Netherlands. This paper demonstrates how sampling theory can be applied to design a disease seroprevalence survey, using pseudorabies virus (PRV, Aujeszky's disease) as an example. In the spring of 1994, the 4 regions in the Netherlands covered by the reg...

Anderson P.L.; Morrison R.B.; Thawley D.G.; Molitor T., 1989: Identification of pseudorabies virus infected swine herds by evaluating the serostatus of boars of finishing pigs. Data were collected from 39 Minnesota swine farms quarantined for pseudorabies virus (PRV) infection. Each herd was serologically evaluated for antibodies to PRV in the sows, boars, and finishing pigs. To identify PRV-seropositive swine herds, the...

Anderson, P.L.; Morrison, R.B.; Thawley, D.G.; Molitor, T., 1989: Identification of pseudorabies virus-infected swine herds by evaluating the serostatus of boars or finishing pigs. Data were collected from 39 Minnesota swine farms quarantined for pseudorabies virus (PRV) infection. Each herd was serologically evaluated for antibodies to PRV in the sows, boars, and finishing pigs. To identify PRV-seropositive swine herds, the...

Jacobs, L.; Voets, R.; Bianchi, A.T., 1999: Detection of pseudorabies virus DNA in individual single-reactor pigs found in certified pseudorabies-free herds. During monitoring of certified pseudorabies (PRV)-free herds to confirm their PRV-free status, occasional individual gE-seropositive pigs are detected. These single-reactor pigs remain gE-seropositive when further serum samples are collected and t...

Stegeman, A.; Elbers, A.R.W.; Loeffen, W.; D.J.ng, M.C.M.; Tielen, M.J.M., 1996: Rate of successful pseudorabies virus introductions in swine breeding herds in the southern Netherlands that participated in an area-wide vaccination programme. In this study we estimated the rate of successful pseudorabies virus (PRV) introductions in PRV-free and PRV-low (5.1% +- 4.4%) seroprevalence breeding herds that participated in an area-wide vaccination programme. During a 3 year period, all bree...

Weibel, W.; Buhlmann, J.; Hani, H., 1983: Comparison of mortality, morbidity and growth rate in ordinary herds and herds in the pig health service. I. Introduction; culling rate. Mortality and culling rate of fattening pigs were compared in 47 farms participating in the pig health service (21 812 animals) and 48 other farms (14 824 animals). Significant differences between the two husbandry systems were found in mortality...

Elbers, A.; Stegeman, J.; Jong, M.-De, 2001: Factors associated with the introduction of classical swine fever virus into pig herds herds in the central area of the 1997. Veterinary record: journal of the British Veterinary Association9, 149(13): 377-382

Anderson, P.L.; Morrison, R.B.; Molitor, T.W.; Thawley, D.G., 1990: Factors associated with circulation of pseudorabies virus within swine herds. Data were collected from 104 Minnesota swine farms quarantined for pseudorabies virus (PRV) infection. Each herd was serologically evaluated for the presence of antibodies to PRV in finishing pigs. Herd management practices, swine housing design,...