Active surveillance and control programme for Salmonella Dublin in Cattle: alternatives to acceptance of endemic infection with poor control options

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This study illustrates how prevalence and incidence of Salmonella Dublin in cattle has been markedly reduced in dairy herds during active surveillance and a control programme targeting infected herds in Denmark from 2002 to 2010. The results suggest that this might by a good alternative to passive surveillance systems.

Register data might be useful for design of effective surveillance programmes for Salmonella Dublin in cattle in the future. Statistical analysis of register-based variables confirmed previously known risk factors for becoming test-positive (i.e. purchase of animals from test-positive herds, number of cattle in test-positive neighbouring herds, herd size and season), but also pointed out additional factors affecting the risk of dairy herds changing status from test-negative to test-positive (indicative of new or recurrent infection). Increasing geometric cell count measured through the mandatory milk quality assurance scheme was associated with increasing risk of becoming test-positive, while participation in a voluntary control programme for paratuberculosis, another bacterial infection with similar transmission patterns, was associated with decreased risk of becoming test-positive. This suggests that there might be synergistic benefits from running control programmes for both infections simultaneously. We did not find the risk of becoming test-positive significantly different between organic and conventional herds, nor between analysing laboratories.

Even when controlling for other risk factors, it was evident that the risk of changing to test-positive was significantly lower after the surveillance programme was supplemented by an intensified control period from October 2007 and onwards than during the surveillance period before 2007.

Original languageEnglish
Title of host publicationProceedings of the International Conference on Animal Health Surveillance, 2011
Number of pages3
Publication date2011
Publication statusPublished - 2011

ID: 38451993