期刊
TROPICAL ANIMAL HEALTH AND PRODUCTION
卷 47, 期 1, 页码 3-11出版社
SPRINGER
DOI: 10.1007/s11250-014-0675-5
关键词
Calf diarrhea; Coronavirus; Escherichia coli; Rotavirus; Salmonella spp.
资金
- Conselho Nacional de Desenvolvimento Tecnico e Cientifico-CNPq
- Pro-Reitoria de Pesquisa da UFMG-PRPq
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais-FAPEMIG
- CNPq
- Conselho Nacional de Desenvolvimento Tecnico e Cientifico-CNPq, Brazil
This prospective longitudinal study investigated the epidemiology of enteric disease associated with infections in calves aging up to 70 days. A total of 850 fecal samples were collected from 67 calves. Seventeen isolates of Salmonella spp. were recovered from feces of 11 calves (16.4 %), and statistical analysis revealed no association between the presence of Salmonella spp. and clinical signs of diarrhea or age. Virulence factors of Escherichia coli were identified in 103 strains: eae (7), K99/STa (7), Stx1 (7), Stx1/eae (36), Stx1/Stx2/eae (2), Stx2 (43), and Stx2/eae (1). There was statistical association between diarrheic animals carrying E. coli Stx1/eae (+) in their feces at 2 and 4 weeks of age (P = 0.003) and E. coli Stx2 (+) at 5 weeks of age (P = 0.03). Rotavirus was detected in 49 (5.76 %) fecal samples collected from 33 calves (49.2 %). The presence of rotavirus was correlated with diarrheic feces (P < 0.0001) rather than feces with normal consistency. There was a significant relationship between age group and diarrhea (P = 0.001). Bovine coronavirus (BCoV) was detected in 93 fecal samples collected from 46 calves (68.6 %). There was an association (P < 0.0001) between diarrheic animals positive for BCoV and age groups. The results demonstrate the importance of the pathogens studied in the etiology of diarrhea in calves.
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