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MULTIPLE-LOCUS VARIABLE-NUMBER TANDEM REPEAT ANALYSIS OF BRUCELLA ISOLATES FROM THAILAND.

Brucellosis-induced abortion can result in significant economic loss
to farm animals. Brucellosis can be transmitted to humans during slaughter of
infected animals or via consumption of contaminated food products. Strain identification
of Brucella isolates can reveal the route of transmission. Brucella strains
were isolated from vaginal swabs of farm animal, cow milk and from human
blood cultures. Multiplex PCR was used to identify Brucella species, and owing
to high DNA homology among Brucella isolates, multiple-locus variable-number
tandem repeat analysis (MLVA) based on the number of tandem repeats at 16 different
genomic loci was used for strain identification. Multiplex PCR categorized
the isolates into B. abortus (n = 7), B. melitensis (n = 37), B. suis (n = 3), and 5 of
unknown Brucella spp. MLVA-16 clustering analysis differentiated the strains into
various genotypes, with Brucella isolates from the same geographic region being
closely related, and revealed that the Thai isolates were phylogenetically distinct
from those in other countries, including within the Southeast Asian region. Thus,
MLVA-16 typing has utility in epidemiological studies.