EurekaMag.com logo
+ Site Statistics
References:
52,725,316
Abstracts:
28,411,598
+ 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

Serologic status of pseudorabies virus in growing-finishing pigs in quarantined herds. Journal of the American Veterinary Medical Association 195(11): 1577-1579, 1989

Estimating sample sizes for a two-stage sampling survey of seroprevalence of pseudorabies virus (PRV)-infected swine at a regional level in The Netherlands. Veterinary Quarterly 17(3): 92-95, 1995

Identification of pseudorabies virus-infected swine herds by evaluating the serostatus of boars or finishing pigs. Journal of the American Veterinary Medical Association 195(12): 1709-1711, 1989

Detection of pseudorabies virus DNA in individual single-reactor pigs found in certified pseudorabies-free herds. Research in Veterinary Science 67(3): 305-307, 1999

Rate of successful pseudorabies virus introductions in swine breeding herds in the southern Netherlands that participated in an area-wide vaccination programme. Preventive Veterinary Medicine 27(1-2): 29-41, 1996

Comparison of mortality, morbidity and growth rate in ordinary herds and herds in the pig health service. I. Introduction; culling rate. Schweizer Archiv fur Tierheilkunde 125(11): 771-777, 1983

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, 2001

Factors associated with circulation of pseudorabies virus within swine herds. Journal of the American Veterinary Medical Association 196(6): 877-880, 1990

Eradication of Aujeszkys disease (Pseudorabies) virus from pig herds. 1999

No massive spread of pseudorabies virus in vaccinated sow herds. Veterinary Microbiology 55(1-4): 147-151, 1997