Brucellosis remains an important anthropozoonosis worldwide. Brucella species are genetically homogeneous, and thus, the typing of Brucella species for epidemiological purposes by conventional molecular typing methods has remained elusive. Although many methods could segregate isolates into the phylogenetically recognized taxa, limited within-species genetic diversity has been identified. Recently, multilocus variablenumber tandem-repeat analysis (MLVA) was found to have a high degree of resolution when it was applied to collections of Brucella isolates from geographically widespread locations, and an assay comprising 16 such loci (MLVA-16) was proposed. This scheme includes eight minisatellite loci (panel 1) and eight microsatellites (panel 2, which is subdivided into panels 2A and 2B). The utility of MLVA-16 for the subtyping of human Brucella isolates from geographically restricted regions needs to be further evaluated, and genotyping databases with worldwide coverage must be progressively established. In the present study, MLVA-16 was applied to the typing of 42 human Brucella isolates obtained from 41 patients recovered from 2002 to 2006 at a tertiary-care center in Lebanon. All isolates were identified as Brucella melitensis by MLVA-16 and were found to be closely related to B. melitensis isolates from neighboring countries in the Middle East when their genotypes were queried against those in the web-based Brucella2007 MLVA database (http://mlva.u-psud.fr/). Panel 2B, which comprised the most variable loci, displayed a very high discriminatory power, while panels 1 and 2A showed limited diversity. The most frequent genotype comprised seven isolates obtained over 7 weeks in 2002, demonstrating an outbreak from a common source. Two isolates obtained from one patient 5 months apart comprised another genotype, indicating relapsing disease. These findings confirm that MLVA-16 has a good discriminatory power for species determination, typing of B. melitensis isolates, and inferring their geographical origin. Abbreviated panel 2B could be used as a short-term epidemiological tool in a small region of endemicity.Brucellae are facultative intracellular pathogens that infect a wide variety of animal species and humans. Brucellosis is the most common anthropozoonosis, with more than 500,000 cases reported annually worldwide (28). The genus Brucella currently encompasses nine recognized species (seven terrestrial and two marine mammal species) that display animal host specificity, among which three present veterinary and public health concerns (11,27,31). Brucella melitensis predominantly infects sheep and goats, B. abortus infects cattle, and B. suis infects swine and a range of wild animals; but cross-infection of other mammalian species, including humans, may occur (10). Animal brucellosis causes abortion and infertility in livestock (cattle, goats, and sheep), resulting in serious economic losses. Human brucellosis is a subacute or chronic febrile illness that can involve multiple organs and that can result in a w...