An Evaluation of the Lineage of <i>Brucella</i> Isolates in Turkey by a Whole-Genome Single-Nucleotide Polymorphism Analysis
Kadir Akar | Katharina Holzer | Ludwig E. Hoelzle | Gülseren Yıldız Öz | Shaimaa Abdelmegid | Emin Ayhan Baklan | Buket Eroğlu | Eray Atıl | Shawky A. Moustafa | Gamal Wareth | Manar Elkhayat
Brucellosis is a disease caused by the <i>Brucella</i> (<i>B.</i>) species. It is a zoonotic disease that affects farm animals and causes economic losses in many countries worldwide. <i>Brucella</i> has the ability to persist in the environment and infect the host at low doses. Thus, it is more important to trace brucellosis outbreaks, identify their sources of infection, and interrupt their transmission. Some countries already have initial data, but most of these data are based on a Multiple-Locus Variable-Number Tandem-Repeat Analysis (MLVA), which is completely unsuitable for studying the <i>Brucella</i> genome. Since brucellosis is an endemic disease in Turkey, this study aimed to examine the genome of Turkish <i>Brucella</i> isolates collected between 2018 and 2020, except for one isolate, which was from 2012. A total of 28 strains of <i>B. melitensis</i> (<i>n</i> = 15) and <i>B. abortus</i> (<i>n</i> = 13) were analyzed using a core-genome single-nucleotide polymorphism (cgSNP) analysis. A potential connection between the Turkish isolates and entries from Sweden, Israel, Syria, Austria, and India for <i>B. melitensis</i> was detected. For <i>B. abortus</i>, there may be potential associations with entries from China. This explains the tight ties found between <i>Brucella</i> strains from neighboring countries and isolates from Turkey. Therefore, it is recommended that strict measures be taken and the possible effects of uncontrolled animal introduction are emphasized.
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