NR ANSS
AU Schwermer,H.; Rufenacht,J.; Doherr,M.G.; Heim,D.
TI [Geographic distribution of BSE in Switzerland]
OT Räumliche Verteilung der BSE in der Schweiz
QU Schweizer Archiv für Tierheilkunde 2002 Dec; 144(12): 701-8
PT journal article
AB Visual evaluation of the occurrence of BAB (born after ban) cases pointed towards spatial clustering. Therefore a statistical analysis of spatial case clustering was conducted using GIS technology. In the initial analysis, all 376 cases (135 BAB, 241 BBB/born before ban) diagnosed through mid of March 2001 were investigated using the spatial scan statistic. Two clusters of BBB cases were identified in the western part of Switzerland, and two clusters of BAB cases in the eastern part. Epidemiological investigations performed within the BAB clusters showed an increased pig density in these cluster regions. Pig density is considered an indicator for the probability of contamination of cattle feed with feed containing meat-and-bone meal that is intended for other species (cross-contamination). In an updated cluster analysis including all cases reported until end of June 2002 (data set B), clusters were identified in the same regions as previously. It was shown that the BAB clusters occurred in different time periods. The small scale differences in cluster size and location are discussed, with an emphasis on the implications for following epidemiological investigations.
IN In der Schweiz fanden die Autoren durch die Untersuchung von 241 vor und 135 nach dem Verfütterungsverbot von 1990 geborenen BSE-Fällen vor und nach dem Verfütterungsverbot jeweils zwei Gegenden mit deutlich erhöhten BSE-Zahlen. In diesen Gegenden stellten die Autoren auch eine erhöhte Dichte der Schweinehaltung fest und sehen darin einen Hinweis auf Kreuzkontaminationen als BSE-Ursache.
MH Animal; Animal Feed/analysis; Cattle; Cluster Analysis; Disease Outbreaks/statistics & numerical data/*veterinary; Encephalopathy, Bovine Spongiform/*epidemiology; English Abstract; Food Contamination; *Geographic Information Systems; Models, Statistical; Population Density; Risk Factors; Swine; Switzerland/epidemiology
AD Bundesamt für Veterinärwesen, Bern-Liebefeld. heinzpeter.schwermer@bvet.admin.ch
SP deutsch
PO Schweiz