FACTORS AFFECTING THE GEOGRAPHIC-DISTRIBUTION OF PSEUDORABIES (AUJESZKYS DISEASE) VIRUS-INFECTION AMONG SWINE HERDS IN ILLINOIS

被引:26
作者
AUSTIN, CC
WEIGEL, RM
机构
[1] Division of Epidemiology and Preventive Medicine, Department of Veterinary Pathobiology, College of Veterinary Medicine, Urbana, IL 61801
关键词
D O I
10.1016/0167-5877(92)90039-I
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
Data on the geographic distribution of swine herds tested for pseudorabies virus (PRV) in the state of Illinois (USA) were analyzed to determine whether the prevalence of PRV-infected herds was clustered geographically at the county level. Second-order analysis of spatial dependence indicated there was a spatial clustering of counties of high PRV prevalence rates and that this clustering was greater than the observed clustering of counties with a large number of swine herds. The clustering of county PRV prevalence rates was most apparent within a radius of 120 km (on the average, approximately two counties away). The association of county PRV prevalence rates with average herd size, geographic density of swine herds in the county and regional (within 120 km) density of PRV-infected herds was analyzed using multiple linear regression. The primary factor affecting county PRV prevalence rates was the regional PRV density, which interacted with the other model variables. For counties with a low regional density of PRV infection, county PRV prevalence rates changed little with a change in county herd density or average herd size. In contrast, for counties with a high regional density of PRV infection, PRV prevalence within a county increased with increasing average herd size and increasing geographic density of swine herds in the county. The results of the current and previous studies implicate an important role for the geographic proximity of infected herds in the spread of PRV among swine herds.
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页码:239 / 250
页数:12
相关论文
共 33 条
[1]  
ALDERINK FJ, 1986, OCT P ANN M US AN HL, P311
[2]  
ANDERSEN JB, 1991, 1ST INT S ER PSEUD A, P113
[3]  
BERAN G, 1991, 1ST INT S ER PSEUD A, P93
[4]  
Bitsch V, 1982, CURRENT TOPICS VET M, V17, P227
[5]  
BOOTS BN, 1988, POINT PATTERN ANAL, V8, P1
[6]  
CHRISTENSEN LS, 1990, VET REC, V127, P471
[7]  
COCHRAN WG, 1977, SAMPLING TECHNIQUES, P361
[8]  
COHEN J, 1983, APPLIED MULTIPLE REG, P317
[9]  
DRAPER NR, 1981, APPL REGRESSION ANAL, P108
[10]   2ND-ORDER NEIGHBORHOOD ANALYSIS OF MAPPED POINT PATTERNS [J].
GETIS, A ;
FRANKLIN, J .
ECOLOGY, 1987, 68 (03) :473-477