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Journal of Clinical Microbiology, 03 1995, 615-617, Vol 33, No. 3
Copyright © 1995 by the American Society for Microbiology. All rights reserved.

Specific detection of Brucella DNA by PCR

C Romero, C Gamazo, M Pardo and I Lopez-Goni
Departamento de Microbiologia, Universidad de Navarra, Pamplona, Spain.

A PCR assay with primers derived from the 16S rRNA sequence of Brucella abortus was developed. Nine different combinations between six primers were tested. One pair of primers, which amplified a 905-bp fragment, was selected. As little as 80 fg of Brucella DNA was detected by this method. DNAs from all of the representative strains of the species and biovars of Brucella and from 23 different Brucella isolates were analyzed and yielded exclusively the 905-bp fragment. No amplification was detected with DNAs from 10 strains phylogenetically related to Brucella spp., 5 gram-negative bacteria showing serological cross- reactions with Brucella spp., and 36 different clinical isolates of non- Brucella species. Only Ochrobactrum anthropi biotype D yielded a PCR product of 905 bp, suggesting a closer relationship between Brucella spp. and O. anthropi biotype D. The specificity and high sensitivity of the PCR assay may provide a valuable tool for the diagnosis of brucellosis.

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