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  • Title: Genetic diversity of Streptococcus equi subsp. zooepidemicus isolated from horses.
    Author: Preziuso S, Moriconi M, Cuteri V.
    Journal: Comp Immunol Microbiol Infect Dis; 2019 Aug; 65():7-13. PubMed ID: 31300129.
    Abstract:
    Streptococcus equi subsp. zooepidemicus (SEZ) is an opportunistic and zoonotic pathogen of horses. In this study, genetic intraspecies variability of SEZ obtained mainly from respiratory and genital samples of horses was investigated by analysis of the 16S-23S rRNA intergenic spacer region (ISR) and of the 16S rRNA gene. 16S-23S ISR rRNA type A1 was predominant, although a high rate of multiple products (30.5%) was obtained. Phylogenetic analysis of the 16S rRNA gene detected three genogroups (I, II and III). 16S rRNA variable regions V1 and V2 are the most important regions for evaluating SEZ intraspecies variability, but at least V1-V5 regions should be considered to avoid mistakes. Analysis of all 16S rRNA sequences available in databases assigned human SEZ to groups I and III but not to group II. These results show a high genetic variability in SEZ collected from different specimens of horses from various regions of Italy.
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