Document Detail

Effects of cow age and pregnancy on Bartonella infection in a herd of dairy cattle.
MedLine Citation:
PMID:  16390945     Owner:  NLM     Status:  MEDLINE    
Bartonella spp. are small hemotropic bacteria infecting mammals. Four Bartonella species have been recently described in cattle and wild ruminants. To date, the biology and possible pathogenic role of Bartonella species isolated from ruminants are poorly understood. Therefore, a dairy herd of 448 cows and heifers was surveyed in order to establish the prevalence of Bartonella bovis and B. chomelii infections, the level of bacteremia, and the relationship between bacteremia and age or pregnancy status. The putative impact of Bartonella infection on production performance (individual milk cell count, milk yield) and reproductive status (success of artificial insemination [AI], placental retention, embryonic death, and abortion) was also assessed. The overall mean prevalence of B. bovis bacteremia was 59%, with the highest prevalence in heifers (92.5%). No B. chomelii was isolated, and 95% (114/120) of the B. bovis strains isolated and tested by PCR-restriction fragment length polymorphism belonged to type I. The level of bacteremia was higher in pregnant cows than in nonpregnant cows (P = 0.05), and the level of bacteremia rose during the last two-thirds of gestation (P < 0.001). There was no correlation between bacteremia and milk yield, individual milk cell count, success of first AI, interval between two calvings, or incidence of abortion and embryonic death. The interval from calving to first AI was shorter and the incidence of placental retention was lower in bacteremic animals than in nonbacteremic ones (P = 0.03 and P = 0.01, respectively).
R Maillard; B Grimard; S Chastant-Maillard; B Chomel; T Delcroix; C Gandoin; C Bouillin; L Halos; M Vayssier-Taussat; H-J Boulouis
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of clinical microbiology     Volume:  44     ISSN:  0095-1137     ISO Abbreviation:  J. Clin. Microbiol.     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2006-01-04     Completed Date:  2006-03-21     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7505564     Medline TA:  J Clin Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  42-6     Citation Subset:  IM    
UMR BIPAR, Unité de Pathologie de la Reproduction, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort, France.
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MeSH Terms
Age Factors
Bartonella / immunology*
Bartonella Infections / immunology,  microbiology,  veterinary*
Cattle Diseases / epidemiology,  microbiology*
Lactation / physiology
Pregnancy Complications / epidemiology,  microbiology,  veterinary*
Reproduction / physiology*

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