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首页> 外文期刊>Revista de salud animal >Cell surface characteristics and adherence of typeable and non-typeable strains of Streptococcus suis from pig farms in Cuba
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Cell surface characteristics and adherence of typeable and non-typeable strains of Streptococcus suis from pig farms in Cuba

机译：古巴养猪场猪链球菌的可分类和不可分类菌株的细胞表面特征和粘附

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Streptococcus suis infection is considered a major problem in the swine industry. There are 35 known serotypes of S. suis based on the capsular polysaccharides (CPS) on the cell surface. Serotype 2 is the most virulent in pigs and humans. Some S. suis strains do not agglutinate with any of the typing antisera and are identified as non-typable strains, which have generally been viewed as organisms that do not cause important clinical infections. Previous studies have shown differences in the composition and properties of the cell surface among these strains. The aim of this study included the characterization of cell hydrophobicity, ability to adhere to plates, and autolysis over time of typeable and non-typeable strains of S. suis from farms of the Cuban western region. The non-typeable strains showed a hydrophobic surface and ability of adhesion to plates. In this work, a fragment of atl gene encoding for the most important autolysine in S. suis was detected in serotypes 2, 9 and non-typeable strains. Correlation between cell adherence, hydrophobicity, and autolysis was only detected in two non-typeable strains, indicating that the non-encapsulated strain was more hydrophobic than the encapsulated strain and suggesting a potential ability to form biofilms. The ability to form biofilms is not required for virulence, but it does contribute towards long-term colonization, transmission and difficulties to eradicate these infections. These results indicated that non-typable strains should be considered when implementing measures to control the pathogenesis of the infection with S. suis in Cuban farms.
机译：猪链球菌感染被认为是养猪业的主要问题。基于细胞表面的荚膜多糖（CPS），存在35种已知的猪链球菌血清型。血清型2在猪和人中是最强毒的。一些猪链球菌菌株不与任何类型的抗血清凝集，并被鉴定为不可分型菌株，通常被视为不会引起重要临床感染的生物。先前的研究表明这些菌株之间细胞表面的组成和性质存在差异。这项研究的目的包括表征细胞疏水性，粘附于平板的能力以及随着时间的推移自古巴西部地区农场生产的猪链球菌可分型和非分型菌株的自溶作用。不可分型菌株显示疏水表面和对板的粘附能力。在这项工作中，在血清型2、9和非分型菌株中检测到编码猪链球菌中最重要的自动赖氨酸的atl基因片段。仅在两个不可分型的菌株中检测到细胞粘附，疏水性和自溶之间的相关性，这表明未包被的菌株比包被的菌株更具疏水性，并暗示了形成生物膜的潜在能力。形成生物膜的能力不是毒力所必需的，但它确实有助于长期定居，传播和根除这些感染的困难。这些结果表明，在古巴农场中采取措施控制猪链球菌感染的发病机理时应考虑非典型菌株。

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