Recurrent clinical mastitis caused by Escherichia ...

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Title Recurrent clinical mastitis caused by Escherichia coli in dairy cows
Author(s) D. Dopfer, H. W. Barkema, T. J. Lam, Y. H. Schukken, W. Gaastra
Journal Journal of Dairy Science
Date 1999
Volume 82
Issue 1
Start page 80
End page 85
Abstract In this study, the occurrence of persistent intramammary infections caused by Escherichia coli with recurrent episodes of clinical mastitis caused by E. coli are described for a cohort of 300 Dutch dairy herds. Calculations on the recurrent episodes were based on data collected by dairy farmers. The genotype of the E. coli strains was determined by means of a polymerase chain reaction using enterobacterial repetitive intergenic consensus (ERIC) primers, resulting in a DNA fingerprint. Quarters in which the same E. coli genotype was found were considered to be persistently infected. In 4.77% of all episodes of clinical mastitis caused by E. coli, persistent intramammary infections caused by the same E. coli genotype were found. Based on the occurrence of the same genotypes, we concluded that, in 2.98% of all episodes, transmission of E. coli strains among quarters within one cow might have occurred. In 13.04% of all episodes of clinical mastitis caused by E. coli in the study, different E. coli genotypes were isolated from recurrent episodes of clinical mastitis within the same cow, indicating that these cows were highly susceptible to recurrent intramammary infections caused by E. coli.

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