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Since 2002, the Qualiti:it und Srcherheit GmbH (QS GmbH) has earned out a serologrcal salmonella monrtonng in German finishrng pig herds. Thrs monitonng arms at reducmg the risk of mtroducmg salmonella into the meat production charn caused by mfected slaughter prgs and to identify and to remove infection sources. For thrs purpose the farms are drfferentrated into three nsk categones (I =low, II = mrddle, Ill = hrgh) by their chance to introduce salmonella into the pork production cham All data generated withm the monitoring are entered mto the central database Qualiproo (Qualitype AG, Dresden). The dataset mvestrgated rncluded 1 762 270 samples taken between April 1, 2003 and March 31 , 2006 originatmg from 15 452 farms. Blood sera or meat JUICes are sampled at slaughterhouses following a scheme (up to 60 samples per year and farm, depending on farm srze) . The laboratones analyse the samples serologically using one of four ELISA-tests and report the results as OD% as well as the decisron "positive"f'negative" (cut-off· 40 OD%). The categonsation is recalculated quarterly based on the percentage of posrtive samples dunng the last 12 months for each farm. A proportron of less than 20% posrtive samples yields m category I, 20-40% category II . ~40% category Ill. The analysis showed that so far 12 545 farms could be categonzed. and, that rn quarter 1-2006, 80% of the farms were rn category I, about 15% in category II , and only 5% m category Ill 11 1% of all samples were serologically positrve. The distributions of the OD%-values differed between the regrons of Germany The North-western parts for Germany showed higher values than other parts of Germany Higher numbers of animals per area as well as per farm and a hrgher rate of partrcrpation m these rntensrve agncultural regions are reasons for the hrgher Salmonella prevalence Apart from regions. smgle nsk factor analyses showed an increase m prevalence by laboratory, testkrt and the slaughterhouse Due to strong mteractions between these factors mulllvanate statrstrcal models have to be used to describe the real rnOuences on the OD%-values correctly The basrc eprdemiologic report can be used to optimrse the salmonella monltonng by evaluating further usefulmformatron Penodical updates of this analysrs wrll help to control the evolution of the Salmonella prevalence rn fattemng pigs in Germany Furthermore, these data can be used to define screntrfic hypotheses and to conduct specific studies

international conference on the epidemiology and control of biological, chemical and physical hazards in pigs and pork

The serological Salmonella Monitoring in German pork production: the structure of the central database and preliminary results of a basic epidemiological report