title: Prevalence of bacteremia in dairy cattle with acute puerperal metritis.
abstract: BACKGROUND
  Acute puerperal metritis (APM) affects 30% of postpartum dairy cattle. Bacteremia negatively impacts survival in cattle with coliform mastitis. However, the prevalence of bacteremia in dairy cattle with APM is unknown.
  
  
  OBJECTIVE
  Bacteremia is detectable in a large proportion of cattle with APM.
  
  
  METHODS
  Seventeen dairy cows with APM and 17 healthy dairy cattle.
  
  
  METHODS
  Prospective case-control study. Cases were identified by daily monitoring of cattle in the first 10 days after calving. Controls were matched to cases by parity and days in milk. Cows were examined at the time of identification of APM. A complete blood count, serum biochemical analysis, and bacteriologic culture of blood and lochial fluid were performed on each animal at the time of diagnosis. The same samples were collected from healthy herdmates of a similar parity and days in milk. Blood culture results and clinicopathologic variables were compared between groups. Conditional logistic regression was used to evaluate factors associated with APM, whereas multivariate logistic regression was used to evaluate factors associated with bacteremia.
  
  
  RESULTS
  Bacteremia occurred in 53% (9/17) of cattle with APM and 53% (8/15) controls. Bacillus spp. was the organism most commonly isolated from the bloodstream in cattle of both groups. Bacteremic cattle in both groups were significantly less likely to have basophils in the peripheral circulation (P = .02) and more likely to have higher serum globulin concentrations (P = .02).
  
  
  CONCLUSIONS
  Bacteremia is a common occurrence in postpartum dairy cattle. Further study is warranted to investigate the modes by which bacteria colonize the bloodstream in this population of animals and the importance of bacteremia on health and productivity of affected animals.
authors.affiliation: Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA.
authors.forename: B C
authors.initials: BC
authors.lastname: Credille
authors.forename: A R
authors.initials: AR
authors.lastname: Woolums
authors.forename: S
authors.initials: S
authors.lastname: Giguère
authors.forename: T
authors.initials: T
authors.lastname: Robertson
authors.forename: M W
authors.initials: MW
authors.lastname: Overton
authors.forename: D J
authors.initials: DJ
authors.lastname: Hurley
mesh_terms: D000818:Animals; D016470:Bacteremia / Q000209:etiology / Q000382:microbiology / Q000662:veterinary*; D016022:Case-Control Studies; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology* / Q000382:microbiology; D004716:Endometritis / Q000150:complications / Q000382:microbiology / Q000662:veterinary*; D005260:Female; D011247:Pregnancy; D015995:Prevalence; D011644:Puerperal Disorders / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*
keywords: Dairy cattle; Inflammation; Postpartum; Sepsis; Uterine
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