Dynamics of endemic infectious diseases of animal and human importance on three dairy herds in the northeastern United States

摘要: Endemic infectious diseases in dairy cattle are of significant concern to the industry as well for public health because their potential impact on animal and human health, milk meat production, food safety, economics. We sought provide insight into dynamics important endemic 3 northeastern US herds. Fecal samples from individual cows various environmental these farms were tested presence major zoonotic pathogens (i.e., Salmonella, Campylobacter, Listeria) commensal bacteria Escherichia coli enterococci. Additionally, Mycobacterium avium ssp. paratuberculosis was fecal serum cows. Test results reproductive records maintained a database, fecal, plasma, DNA, tissue kept biobank. All interest detected variable both within between farms. The prevalence Listeria spp. L. monocytogenes farm A ranged 0 68.2% 25.5%, respectively, over period yr. Within B, continuous shedding Salmonella observed with ranging 8 88%; Cerro predominant serotype. Farm C appeared less contaminated Listeria, although summer 2005, 50 19.2% positive monocytogenes, respectively. high E. (89 100%), Enterococcus (75 Campylobacter (0 81%) feces suggested they ubiquitous throughout environment. culture ELISA indicated low infection 13.6% 4.9% culture-positive ELISA-positive, respectively), occasional shedders observed. Results have implications safety epidemiology by providing better understanding disease Comprehensive infections may lead management practices pathogen reduction programs control reduce on-farm contamination prevent further entry food-chain.