Document Detail

Prevalence and antimicrobial resistance patterns of Salmonella enterica in preweaned calves from dairies and calf ranches.
MedLine Citation:
PMID:  16948605     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To evaluate serovar and antimicrobial resistance patterns of Salmonella enterica isolated from preweaned calves and identify management risk factors associated with fecal shedding of S enterica. SAMPLE POPULATION: Cohorts of 10 to 15 preweaned calves (1 to 84 days of age) on 26 dairies and 7 calf ranches and cross-sectional samples of preweaned calves on smaller farms. PROCEDURES: Calves were evaluated every 2 weeks during a 6-week period. Salmonella isolates obtained from rectal fecal swabs underwent antimicrobial susceptibility testing against 12 antimicrobials. Cluster analysis enabled description of antimicrobial susceptibility patterns. Calf, cohort, and farm risk factors associated with both the prevalence of S enterica and multiple-antimicrobial-resistant S enterica in preweaned calves were identified with repeated-measure logistic regression models. RESULTS: Salmonella enterica was detected on > 50% of farms and in 7.5% of 3,686 fecal samples. Many isolates (33%) were resistant to multiple antimicrobials. Shedding of Salmonella spp was negatively associated with increasing calf age, herds being closed to incoming cattle, and antimicrobial supplementation of milk replacer; prophylactic antimicrobial treatment in day-old calves increased shedding. No association between farm management and presence of multiple-antimicrobial-resistant S enterica or between calving management and presence of S enterica in calves < or = 1 week old was detected. CONCLUSIONS AND CLINICAL RELEVANCE: In preweaned calves, the most important factors associated with decreased likelihood of fecal shedding of S enterica were the use of antimicrobial-supplemented milk replacer and maintenance of a closed herd. Infection with multiple-antimicrobial-resistant S enterica was not associated with antimicrobial administration.
Anna Catharina B Berge; Dale A Moore; William M Sischo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of veterinary research     Volume:  67     ISSN:  0002-9645     ISO Abbreviation:  Am. J. Vet. Res.     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-09-04     Completed Date:  2006-10-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375011     Medline TA:  Am J Vet Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1580-8     Citation Subset:  IM    
Department of Population Health and Reproduction, Veterinary Medicine Teaching and Research Center, University of California, Tulare, CA 93274, USA.
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MeSH Terms
Animal Husbandry
Animals, Suckling
California / epidemiology
Cattle Diseases / epidemiology,  microbiology*
Cohort Studies
Cross-Sectional Studies
Drug Resistance, Bacterial
Feces / microbiology
Logistic Models
Longitudinal Studies
Microbial Sensitivity Tests / veterinary
Risk Factors
Salmonella Infections, Animal / epidemiology,  microbiology*
Salmonella enterica / drug effects*,  growth & development,  isolation & purification*

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