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Herd prevalence of Salmonella enterica infections in Danish slaughter pigs determined by microbiological testing |
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| Authors: | D L Baggesen H C Wegener F Bager H Stege J Christensen |
| Institution: | a Danish Veterinary Laboratory, 27 Bülowsvej, DK-1790, Copenhagen V, Denmark b Federation of Danish Pig Producers and Slaughterhouses, 3 Axeltorv, DK-1609, Copenhagen V, Denmark c Danish Veterinary Service, 25 Rolighedsvej, DK-1958, Frederiksberg C, Denmark |
| Abstract: | As a part of a nationwide programme to survey and control salmonella in pig herds, a microbiological survey of 1363 pig herds was performed in Denmark. A total of 13 468 slaughter pigs were examined at slaughter by culture of 5 g of caecal contents. Overall, 30 different serotypes of Salmonella enterica were isolated from 832 pigs (6.2%). The predominant serotype was S. Typhimurium, comprising 536 (64.4%) of the isolates. Four hundred and forty-eight isolates of S. Typhimurium were examined by phage typing, resulting in detection of 17 different phage types (definitive types, DT) with DT12 being the most frequent (49.1%). Salmonella enterica was found in 302 herds (22.2%), S. Typhimurium was found in 61.1% of these. 279 (23.1%) large herds (producing more than 2600 slaughter pigs per year) were found to be salmonella positive compared with 23 (14.7 %) small herds (annual production of 500 to 550 slaughter pigs). Practical constraints in the study design did not allow for a firm conclusion on the interplay among herd size, geographical location and occurrence of salmonella. In 284 of 302 infected herds (94.0%) only one serotype was detected. Infections with two different serovars were seen in 18 herds (6.0%). |
| Keywords: | Salmonella enterica Serovars Phage types Epidemiology Slaughter pigs Sensitivity Aggregate test |
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