NR AXUQ
AU Polak,M.P.; Skublicki,P.; Berkvens,D.; Saegerman,C.
TI BSE Epidemic Trend in Poland based on Age Distribution at Time of Detection
QU International Conference - Prion 2007 (26.-28.9.2007) Edinburgh International Conference Centre, Edinburgh, Scotland, UK - Book of Abstracts: Epidemiology, Risk Assessment and Transmission P04.62
IA http://www.prion2007.com/pdf/Prion Book of Abstracts.pdf
PT Konferenz-Poster
AB
B. Bovine spongiform Encephalopathy BSE epidemic in Poland started in May 2002 when first case was diagnosed with rapid test and confirmed. Overall between May 2002 and December 2006, 50 cases were found: 2 in passive surveillance and 48 in active monitoring (42 were healthy slaughtered cows and 6 were risk animals). Most of the cases were diagnosed with Bio-Rad test (35), while two additional rapid tests were also used. A./O. The aim of the study was to evaluate BSE epidemic trend in Poland based on Belgian and Great Britain experience with age distribution at time of detection as the main indicator.
M. Epidemiological data was used for the calculations especially: the age at detection, the date of detection, a type of rapid test used for preliminary diagnosis, incidence rate ratios for every quarter of a given year. R. When age of 50 cases of BSE recorded in Poland between 2002 and 2006 was evaluated in relation to the date they were detected, and all three rapid tests were considered, this turned out to be not an appropriate indicator. However when only the same test was taken into account (Bio-Rad test) and age of 35 cases of BSE in relation to the date they were detected was considered, this was an appropriate indicator with growing tendency of age in time. More BSE cases in Poland were detected in the first quarter of each year and those were not linked to the number of animals tested. This trend was unchanged for all streams and all tests used. Incidence rate ratio (IRR) for the first quarter when compared with other quarters was 3.05 (for all streams) and 3.80 (for healthy slaughtered). There were less cases in animals older than 7 to 9 years (IRR=0.84) and older than more 9 years (IRR=0.27) than in animals aged 4 to 7 years. D. When evaluating several tests together, the interpretation of the indicator must be performed for each test separately because each test has its own, specific characteristics. The use of Bio-Rad test is appropriate and indicates an increase of the trend of age at detection of BSE cases in Poland. More BSE cases were detected in the first quarter of each year. Further research is required to investigate this finding. Several hypothesis were formulated to explain this phenomenon like careful supervision of animals by their keepers during that period, making it more likely to notice mild signs of weight loss and decrease in milk yield, and cull the animal, as has been proposed by Wilesmith (1998).
AD M.P. Polak, National Veterinary Research Institute, Poland; P. Skublicki, General Veterinary Inspectorate, Poland; D. Berkvens, Institute of Tropical Medicine, Department of Tropical Animal Health and Productio, Belgium; C. Saegerman, Secretariat of the Scientific Committee, Administration of Control Policy, Federal Agency for the Safety of the Food Chain, Belgium
SP englisch
PO Schottland